Bug Summary

File:utils/libdom.c
Warning:line 411, column 17
File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name libdom.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/var/lib/jenkins/workspace/scan-build-netsurf -fcoverage-compilation-dir=/var/lib/jenkins/workspace/scan-build-netsurf -resource-dir /usr/lib/llvm-19/lib/clang/19 -isystem /usr/include/mit-krb5 -I . -I include -I build/Linux-gtk2 -I frontends -I content/handlers -D WITH_JPEG -U WITH_PDF_EXPORT -D LIBICONV_PLUG -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -I /usr/include/x86_64-linux-gnu -I /usr/include/p11-kit-1 -D WITH_CURL -D WITH_OPENSSL -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D UTF8PROC_EXPORTS -D WITH_UTF8PROC -I /usr/include/webp -D WITH_WEBP -I /usr/include/libpng16 -D WITH_PNG -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include/ -D WITH_BMP -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_GIF -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NS_SVG -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NSSPRITE -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NSPSL -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NSLOG -D NETSURF_UA_FORMAT_STRING="Mozilla/5.0 (%s) NetSurf/%d.%d" -D NETSURF_HOMEPAGE="about:welcome" -D NETSURF_LOG_LEVEL=VERBOSE -D NETSURF_BUILTIN_LOG_FILTER="(level:WARNING || cat:jserrors)" -D NETSURF_BUILTIN_VERBOSE_FILTER="(level:VERBOSE || cat:jserrors)" -D STMTEXPR=1 -I /usr/include/librsvg-2.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/libpng16 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/cairo -I /usr/include/freetype2 -I /usr/include/pixman-1 -I /usr/include/harfbuzz -I /usr/include/libxml2 -I /usr/include/pango-1.0 -I /usr/include/fribidi -D WITH_RSVG -I /usr/include/gtk-2.0 -I /usr/lib/x86_64-linux-gnu/gtk-2.0/include -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/atk-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -D gtk -D nsgtk -D G_DISABLE_SINGLE_INCLUDES -D G_DISABLE_DEPRECATED -D GTK_DISABLE_SINGLE_INCLUDES -D GTK_MULTIHEAD_SAFE -D PANGO_DISABLE_DEPRECATED -D GTK_DISABLE_DEPRECATED -D _XOPEN_SOURCE=700 -D _POSIX_C_SOURCE=200809L -D _BSD_SOURCE -D _DEFAULT_SOURCE -D _NETBSD_SOURCE -D GTK_RESPATH="/var/lib/jenkins/artifacts-x86_64-linux-gnu/share/netsurf/:./frontends/gtk/res/" -D WITH_GRESOURCE -D DUK_OPT_HAVE_CUSTOM_H -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wwrite-strings -Wno-unused-parameter -Wno-unused-but-set-variable -std=c99 -fconst-strings -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -vectorize-loops -vectorize-slp -analyzer-display-progress -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/lib/jenkins/workspace/scan-build-netsurf/clangScanBuildReports/2025-11-26-172431-2397091-1 -x c utils/libdom.c
1/*
2 * Copyright 2012 Vincent Sanders <vince@netsurf-browser.org>
3 *
4 * This file is part of NetSurf, http://www.netsurf-browser.org/
5 *
6 * NetSurf is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * NetSurf is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19/** \file
20 * libdom utilities (implementation).
21 */
22
23#include <assert.h>
24#include <string.h>
25#include <dom/dom.h>
26
27#include "utils/config.h"
28#include "utils/log.h"
29#include "utils/libdom.h"
30
31
32/* exported interface documented in libdom.h */
33dom_node *libdom_find_first_element(dom_node *parent, lwc_string *element_name)
34{
35 dom_node *element;
36 dom_exception exc;
37 dom_string *node_name = NULL((void*)0);
38 dom_node_type node_type;
39 dom_node *next_node;
40
41 exc = dom_node_get_first_child(parent, &element)dom_node_get_first_child( (dom_node *) (parent), (dom_node **
) (&element));
42 if ((exc != DOM_NO_ERR) || (element == NULL((void*)0))) {
43 return NULL((void*)0);
44 }
45
46 /* find first node thats a element */
47 do {
48 exc = dom_node_get_node_type(element, &node_type)dom_node_get_node_type( (dom_node *) (element), (dom_node_type
*) (&node_type));
49
50 if ((exc == DOM_NO_ERR) && (node_type == DOM_ELEMENT_NODE)) {
51 exc = dom_node_get_node_name(element, &node_name)dom_node_get_node_name((dom_node *) (element), (&node_name
));
52 if ((exc == DOM_NO_ERR) && (node_name != NULL((void*)0))) {
53 if (dom_string_caseless_lwc_isequal(node_name,
54 element_name)) {
55 dom_string_unref(node_name);
56 break;
57 }
58 dom_string_unref(node_name);
59 }
60 }
61
62 exc = dom_node_get_next_sibling(element, &next_node)dom_node_get_next_sibling( (dom_node *) (element), (dom_node *
*) (&next_node));
63 dom_node_unref(element)dom_node_unref((dom_node *) (element));
64 if (exc == DOM_NO_ERR) {
65 element = next_node;
66 } else {
67 element = NULL((void*)0);
68 }
69 } while (element != NULL((void*)0));
70
71 return element;
72}
73
74/* exported interface documented in libdom.h */
75/* TODO: return appropriate errors */
76nserror libdom_iterate_child_elements(dom_node *parent,
77 libdom_iterate_cb cb, void *ctx)
78{
79 dom_nodelist *children;
80 uint32_t index, num_children;
81 dom_exception error;
82
83 error = dom_node_get_child_nodes(parent, &children)dom_node_get_child_nodes( (dom_node *) (parent), (struct dom_nodelist
**) (&children));
84 if (error != DOM_NO_ERR || children == NULL((void*)0))
85 return NSERROR_NOMEM;
86
87 error = dom_nodelist_get_length(children, &num_children);
88 if (error != DOM_NO_ERR) {
89 dom_nodelist_unref(children);
90 return NSERROR_NOMEM;
91 }
92
93 for (index = 0; index < num_children; index++) {
94 dom_node *child;
95 dom_node_type type;
96
97 error = dom_nodelist_item(children, index, &child)_dom_nodelist_item((dom_nodelist *) (children), (uint32_t) (index
), (dom_node **) (&child));
98 if (error != DOM_NO_ERR) {
99 dom_nodelist_unref(children);
100 return NSERROR_NOMEM;
101 }
102
103 error = dom_node_get_node_type(child, &type)dom_node_get_node_type( (dom_node *) (child), (dom_node_type *
) (&type));
104 if (error == DOM_NO_ERR && type == DOM_ELEMENT_NODE) {
105 nserror err = cb(child, ctx);
106 if (err != NSERROR_OK) {
107 dom_node_unref(child)dom_node_unref((dom_node *) (child));
108 dom_nodelist_unref(children);
109 return err;
110 }
111 }
112
113 dom_node_unref(child)dom_node_unref((dom_node *) (child));
114 }
115
116 dom_nodelist_unref(children);
117
118 return NSERROR_OK;
119}
120
121/* exported interface documented in libdom.h */
122nserror libdom_hubbub_error_to_nserror(dom_hubbub_error error)
123{
124 switch (error) {
125
126 /* HUBBUB_REPROCESS is not handled here because it can
127 * never occur outside the hubbub treebuilder
128 */
129
130 case DOM_HUBBUB_OK:
131 /* parsed ok */
132 return NSERROR_OK;
133
134 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_PAUSED):
135 /* hubbub input paused */
136 return NSERROR_OK;
137
138 case DOM_HUBBUB_NOMEM:
139 /* out of memory error from DOM */
140 return NSERROR_NOMEM;
141
142 case DOM_HUBBUB_BADPARM:
143 /* Bad parameter passed to creation */
144 return NSERROR_BAD_PARAMETER;
145
146 case DOM_HUBBUB_DOM:
147 /* DOM call returned error */
148 return NSERROR_DOM;
149
150 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_ENCODINGCHANGE):
151 /* encoding changed */
152 return NSERROR_ENCODING_CHANGE;
153
154 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_NOMEM):
155 /* out of memory error from parser */
156 return NSERROR_NOMEM;
157
158 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_BADPARM):
159 return NSERROR_BAD_PARAMETER;
160
161 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_INVALID):
162 return NSERROR_INVALID;
163
164 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_FILENOTFOUND):
165 return NSERROR_NOT_FOUND;
166
167 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_NEEDDATA):
168 return NSERROR_NEED_DATA;
169
170 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_BADENCODING):
171 return NSERROR_BAD_ENCODING;
172
173 case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_UNKNOWN):
174 /* currently only generated by the libdom hubbub binding */
175 return NSERROR_DOM;
176 default:
177 /* unknown error */
178 /** @todo better error handling and reporting */
179 return NSERROR_UNKNOWN;
180 }
181 return NSERROR_UNKNOWN;
182}
183
184
185static void ignore_dom_msg(uint32_t severity, void *ctx, const char *msg, ...)
186{
187}
188
189
190
191/**
192 * Dump attribute/value for an element node
193 *
194 * \param node The element node to dump attribute details for
195 * \param f file handle to dump to.
196 * \param attribute The attribute to dump
197 * \return true on success, or false on error
198 */
199static bool_Bool dump_dom_element_attribute(dom_node *node, FILE *f, const char *attribute)
200{
201 dom_exception exc;
202 dom_string *attr = NULL((void*)0);
203 dom_string *attr_value = NULL((void*)0);
204 dom_node_type type;
205 const char *string;
206 size_t length;
207
208 /* Should only have element nodes here */
209 exc = dom_node_get_node_type(node, &type)dom_node_get_node_type( (dom_node *) (node), (dom_node_type *
) (&type));
210 if (exc != DOM_NO_ERR) {
211 fprintf(f, " Exception raised for node_get_node_type\n");
212 return false0;
213 }
214 assert(type == DOM_ELEMENT_NODE)((type == DOM_ELEMENT_NODE) ? (void) (0) : __assert_fail ("type == DOM_ELEMENT_NODE"
, "utils/libdom.c", 214, __extension__ __PRETTY_FUNCTION__));
215
216 /* Create a dom_string containing required attribute name. */
217 exc = dom_string_create_interned((uint8_t *)attribute,
218 strlen(attribute), &attr);
219 if (exc != DOM_NO_ERR) {
220 fprintf(f, " Exception raised for dom_string_create\n");
221 return false0;
222 }
223
224 /* Get class attribute's value */
225 exc = dom_element_get_attribute(node, attr, &attr_value)dom_element_get_attribute( (dom_element *) (node), (attr), (&
attr_value));
226 if (exc != DOM_NO_ERR) {
227 fprintf(f, " Exception raised for element_get_attribute\n");
228 dom_string_unref(attr);
229 return false0;
230 } else if (attr_value == NULL((void*)0)) {
231 /* Element lacks required attribute */
232 dom_string_unref(attr);
233 return true1;
234 }
235
236 /* Finished with the attr dom_string */
237 dom_string_unref(attr);
238
239 /* Get attribute value's string data */
240 string = dom_string_data(attr_value);
241 length = dom_string_byte_length(attr_value);
242
243 /* Print attribute info */
244 fprintf(f, " %s=\"%.*s\"", attribute, (int)length, string);
245
246 /* Finished with the attr_value dom_string */
247 dom_string_unref(attr_value);
248
249 return true1;
250}
251
252
253/**
254 * Print a line in a DOM structure dump for an element
255 *
256 * \param node The node to dump
257 * \param f file handle to dump to.
258 * \param depth The node's depth
259 * \return true on success, or false on error
260 */
261static bool_Bool dump_dom_element(dom_node *node, FILE *f, int depth)
262{
263 dom_exception exc;
264 dom_string *node_name = NULL((void*)0);
265 dom_node_type type;
266 int i;
267 const char *string;
268 size_t length;
269
270 /* Only interested in element nodes */
271 exc = dom_node_get_node_type(node, &type)dom_node_get_node_type( (dom_node *) (node), (dom_node_type *
) (&type));
272 if (exc != DOM_NO_ERR) {
273 fprintf(f, "Exception raised for node_get_node_type\n");
274 return false0;
275 } else if (type != DOM_ELEMENT_NODE) {
276 /* Nothing to print */
277 return true1;
278 }
279
280 /* Get element name */
281 exc = dom_node_get_node_name(node, &node_name)dom_node_get_node_name((dom_node *) (node), (&node_name));
282 if (exc != DOM_NO_ERR) {
283 fprintf(f, "Exception raised for get_node_name\n");
284 return false0;
285 } else if (node_name == NULL((void*)0)) {
286 fprintf(f, "Broken: root_name == NULL\n");
287 return false0;
288 }
289
290 /* Print ASCII tree structure for current node */
291 if (depth > 0) {
292 for (i = 0; i < depth; i++) {
293 fprintf(f, "| ");
294 }
295 fprintf(f, "+-");
296 }
297
298 /* Get string data and print element name */
299 string = dom_string_data(node_name);
300 length = dom_string_byte_length(node_name);
301 fprintf(f, "[%.*s]", (int)length, string);
302
303 if (length == 5 && strncmp(string, "title", 5) == 0) {
304 /* Title tag, gather the title */
305 dom_string *str;
306 exc = dom_node_get_text_content(node, &str)dom_node_get_text_content( (dom_node *) (node), (&str));
307 if (exc == DOM_NO_ERR && str != NULL((void*)0)) {
308 fprintf(f, " $%.*s$", (int)dom_string_byte_length(str),
309 dom_string_data(str));
310 dom_string_unref(str);
311 }
312 }
313
314 /* Finished with the node_name dom_string */
315 dom_string_unref(node_name);
316
317 /* Print the element's id & class, if it has them */
318 if (dump_dom_element_attribute(node, f, "id") == false0 ||
319 dump_dom_element_attribute(node, f, "class") == false0) {
320 /* Error occured */
321 fprintf(f, "\n");
322 return false0;
323 }
324
325 fprintf(f, "\n");
326 return true1;
327}
328
329
330/* exported interface documented in libdom.h */
331nserror libdom_dump_structure(dom_node *node, FILE *f, int depth)
332{
333 dom_exception exc;
334 dom_node *child;
335 nserror ret;
336 dom_node *next_child;
337
338 /* Print this node's entry */
339 if (dump_dom_element(node, f, depth) == false0) {
340 /* There was an error; return */
341 return NSERROR_DOM;
342 }
343
344 /* Get the node's first child */
345 exc = dom_node_get_first_child(node, &child)dom_node_get_first_child( (dom_node *) (node), (dom_node **) (
&child));
346 if (exc != DOM_NO_ERR) {
347 fprintf(f, "Exception raised for node_get_first_child\n");
348 return NSERROR_DOM;
349 } else if (child != NULL((void*)0)) {
350 /* node has children; decend to children's depth */
351 depth++;
352
353 /* Loop though all node's children */
354 do {
355 /* Visit node's descendents */
356 ret = libdom_dump_structure(child, f, depth);
357 if (ret !=NSERROR_OK) {
358 /* There was an error; return */
359 dom_node_unref(child)dom_node_unref((dom_node *) (child));
360 return NSERROR_DOM;
361 }
362
363 /* Go to next sibling */
364 exc = dom_node_get_next_sibling(child, &next_child)dom_node_get_next_sibling( (dom_node *) (child), (dom_node **
) (&next_child));
365 if (exc != DOM_NO_ERR) {
366 fprintf(f, "Exception raised for node_get_next_sibling\n");
367 dom_node_unref(child)dom_node_unref((dom_node *) (child));
368 return NSERROR_DOM;
369 }
370
371 dom_node_unref(child)dom_node_unref((dom_node *) (child));
372 child = next_child;
373 } while (child != NULL((void*)0)); /* No more children */
374 }
375
376 return NSERROR_OK;
377}
378
379
380/* exported interface documented in libdom.h */
381nserror libdom_parse_file(const char *filename, const char *encoding, dom_document **doc)
1
[debug] analyzing from libdom_parse_file
→
382{
383 dom_hubbub_parser_params parse_params;
384 dom_hubbub_error error;
385 dom_hubbub_parser *parser;
386 dom_document *document;
387 FILE *fp = NULL((void*)0);
388#define BUF_SIZE512 512
389 uint8_t buf[BUF_SIZE512];
390
391 fp = fopen(filename, "r");
392 if (fp
1.1
'fp' is not equal to NULL
 == NULL((void*)0)) {
2
←
Taking false branch
→
393 return NSERROR_NOT_FOUND;
394 }
395
396 parse_params.enc = encoding;
397 parse_params.fix_enc = false0;
398 parse_params.enable_script = false0;
399 parse_params.msg = ignore_dom_msg;
400 parse_params.script = NULL((void*)0);
401 parse_params.ctx = NULL((void*)0);
402 parse_params.daf = NULL((void*)0);
403
404 error = dom_hubbub_parser_create(&parse_params, &parser, &document);
405 if (error != DOM_HUBBUB_OK) {
3
←
Assuming 'error' is equal to DOM_HUBBUB_OK
→
4
←
Taking false branch
→
406 fclose(fp);
407 return libdom_hubbub_error_to_nserror(error);
408 }
409
410 while (feof(fp) == 0) {
5
←
Loop condition is true. Entering loop body
→
9
←
Loop condition is true. Entering loop body
→
411 size_t read = fread(buf, sizeof(buf[0]), BUF_SIZE512, fp);
6
←
Assuming this stream operation fails
→
10
←
File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior
412
413 error = dom_hubbub_parser_parse_chunk(parser, buf, read);
414 if (error != DOM_HUBBUB_OK) {
7
←
Assuming 'error' is equal to DOM_HUBBUB_OK
→
8
←
Taking false branch
→
415 dom_node_unref(document)dom_node_unref((dom_node *) (document));
416 dom_hubbub_parser_destroy(parser);
417 fclose(fp);
418 return NSERROR_DOM;
419 }
420 }
421
422 error = dom_hubbub_parser_completed(parser);
423 if (error != DOM_HUBBUB_OK) {
424 dom_node_unref(document)dom_node_unref((dom_node *) (document));
425 dom_hubbub_parser_destroy(parser);
426 fclose(fp);
427 return libdom_hubbub_error_to_nserror(error);
428 }
429
430 dom_hubbub_parser_destroy(parser);
431 fclose(fp);
432
433 *doc = document;
434 return NSERROR_OK;
435}