http://llvm.org/bugs/show_bug.cgi?id=19661
Bug ID: 19661
Summary: strcmp call modifies constant value in adjacent struct
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12482
--> http://llvm.org/bugs/attachment.cgi?id=12482&action=edit
minimal test case
Static analyzer thinks that strcmp() modifies memory adjacent to strcmp()
parameters. The problem doesn't happen if I use strcasecmp() instead of
strcmp(). Please see attached minimal example and report file.
Excerpt:
18 switch (setting->type) {
Control jumps to 'case ST_STRING:' at line 19
19 case ST_STRING:
20 /* strcmp triggers the error */
21 if (strcmp(setting->value_char, value) == 0)
Taking false branch
22 /* but strcasecmp doesn't trigger the error! */
23 //if (strcasecmp(setting->value_char, value) == 0)
24 return 1;
25 break;
...
33 switch (setting->type) {
Control jumps to 'case ST_UNSIGNED_INTEGER:' at line 37
Apparently, analyzer thinks that setting->type was changed in strcmp() call.
Please see attached files for structure definitions etc.
Have a nice day!
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