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* [Bug analyzer/105906] New: fanalyzer strdup false positive leak in loop @ 2022-06-09 9:33 contino at epigenesys dot com 2022-06-10 12:19 ` [Bug analyzer/105906] " dmalcolm at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: contino at epigenesys dot com @ 2022-06-09 9:33 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105906 Bug ID: 105906 Summary: fanalyzer strdup false positive leak in loop Product: gcc Version: 12.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: analyzer Assignee: dmalcolm at gcc dot gnu.org Reporter: contino at epigenesys dot com Target Milestone: --- Created attachment 53109 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53109&action=edit The warning Hi, compiling the code with GCC-12.1.0 on Debian I am seeing the fanalyzer warning in the attachment, which seems to me a false positive leak related to strdup. Code: #include <stddef.h> #include <stdlib.h> #include <string.h> #define LEN 64 char **__epystr_explode(const char *delim, char *str) { char **out = NULL; int i; if (str == NULL || delim == NULL) return NULL; out = malloc(LEN * sizeof(char *)); if (out == NULL) return NULL; for (i = 0; i < LEN; i++) { out[i] = strdup("bla"); if (out[i] == NULL) goto freem; } return out; freem: while (--i >= 0) free(out[i]); free(out); return NULL; } If I replace strdup with malloc the warning disappears. for (i = 0; i < LEN; i++) { out[i] = malloc(10); if (out[i] == NULL) goto freem; } The same happens if I replace the for loop with a goto loop. i = 0; loop: out[i] = strdup("bla"); if (out[i] == NULL) goto freem; i++ if (i < LEN) goto loop; ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug analyzer/105906] fanalyzer strdup false positive leak in loop 2022-06-09 9:33 [Bug analyzer/105906] New: fanalyzer strdup false positive leak in loop contino at epigenesys dot com @ 2022-06-10 12:19 ` dmalcolm at gcc dot gnu.org 2023-03-13 18:36 ` dmalcolm at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: dmalcolm at gcc dot gnu.org @ 2022-06-10 12:19 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105906 David Malcolm <dmalcolm at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2022-06-10 Ever confirmed|0 |1 --- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Thanks for filing this bug. Confirmed, and it still affects trunk: reproducer here: https://godbolt.org/z/P43bbMMW7 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug analyzer/105906] fanalyzer strdup false positive leak in loop 2022-06-09 9:33 [Bug analyzer/105906] New: fanalyzer strdup false positive leak in loop contino at epigenesys dot com 2022-06-10 12:19 ` [Bug analyzer/105906] " dmalcolm at gcc dot gnu.org @ 2023-03-13 18:36 ` dmalcolm at gcc dot gnu.org 2023-03-13 18:37 ` dmalcolm at gcc dot gnu.org 2023-03-13 18:54 ` cvs-commit at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: dmalcolm at gcc dot gnu.org @ 2023-03-13 18:36 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105906 --- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Looks like this is fixed on trunk for GCC 13; seem to have been via 688fc162b76dc6747a30fcfd470f4770da0f4924 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug analyzer/105906] fanalyzer strdup false positive leak in loop 2022-06-09 9:33 [Bug analyzer/105906] New: fanalyzer strdup false positive leak in loop contino at epigenesys dot com 2022-06-10 12:19 ` [Bug analyzer/105906] " dmalcolm at gcc dot gnu.org 2023-03-13 18:36 ` dmalcolm at gcc dot gnu.org @ 2023-03-13 18:37 ` dmalcolm at gcc dot gnu.org 2023-03-13 18:54 ` cvs-commit at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: dmalcolm at gcc dot gnu.org @ 2023-03-13 18:37 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105906 --- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> --- (In reply to David Malcolm from comment #2) > Looks like this is fixed on trunk for GCC 13; seem to have been via > 688fc162b76dc6747a30fcfd470f4770da0f4924 aka r13-5113-g688fc162b76dc6 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug analyzer/105906] fanalyzer strdup false positive leak in loop 2022-06-09 9:33 [Bug analyzer/105906] New: fanalyzer strdup false positive leak in loop contino at epigenesys dot com ` (2 preceding siblings ...) 2023-03-13 18:37 ` dmalcolm at gcc dot gnu.org @ 2023-03-13 18:54 ` cvs-commit at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2023-03-13 18:54 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105906 --- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by David Malcolm <dmalcolm@gcc.gnu.org>: https://gcc.gnu.org/g:23532dac3f602d6c29f5b7062c7fe30905061764 commit r13-6641-g23532dac3f602d6c29f5b7062c7fe30905061764 Author: David Malcolm <dmalcolm@redhat.com> Date: Mon Mar 13 14:53:05 2023 -0400 testsuite: add test coverage for analyzer leak false +ve [PR105906] Adding regression test coverage; I believe I fixed this leak false positive with r13-5113-g688fc162b76dc6. gcc/testsuite/ChangeLog: PR analyzer/105906 * gcc.dg/analyzer/leak-pr105906.c: New test. Signed-off-by: David Malcolm <dmalcolm@redhat.com> ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-03-13 18:54 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-06-09 9:33 [Bug analyzer/105906] New: fanalyzer strdup false positive leak in loop contino at epigenesys dot com 2022-06-10 12:19 ` [Bug analyzer/105906] " dmalcolm at gcc dot gnu.org 2023-03-13 18:36 ` dmalcolm at gcc dot gnu.org 2023-03-13 18:37 ` dmalcolm at gcc dot gnu.org 2023-03-13 18:54 ` cvs-commit at gcc dot gnu.org
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