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From: "bruno at clisp dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/109990] New: [12 Regression] Bogus -Wuse-after-free warning after realloc Date: Fri, 26 May 2023 13:58:40 +0000 [thread overview] Message-ID: <bug-109990-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109990 Bug ID: 109990 Summary: [12 Regression] Bogus -Wuse-after-free warning after realloc Product: gcc Version: 13.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: bruno at clisp dot org Target Milestone: --- Created attachment 55168 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55168&action=edit test case bar.c Compiling the attached file produces a warning that is not justified: $ gcc -Wall -O2 -S bar.c bar.c: In function ‘read_alias_file’: bar.c:122:52: warning: pointer may be used after ‘realloc’ [-Wuse-after-free] 122 | map[i].alias += new_pool - string_space; | ~~~~~~~~~^~~~~~~~~~~~~~ bar.c:114:45: note: call to ‘realloc’ here 114 | char *new_pool = (char *) realloc (string_space, new_size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The warning is not justified because only the pointer 'string_space' is used here; it is not being dereferenced. Seen with gcc 12.3.0 and 13.1.0.
next reply other threads:[~2023-05-26 13:58 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-05-26 13:58 bruno at clisp dot org [this message] 2023-05-26 14:25 ` [Bug middle-end/109990] [12/13/14 " pinskia at gcc dot gnu.org 2023-05-26 14:30 ` pinskia at gcc dot gnu.org 2023-05-26 14:31 ` pinskia at gcc dot gnu.org 2023-05-26 16:27 ` bruno at clisp dot org 2023-05-26 16:36 ` bruno at clisp dot org 2023-05-26 16:39 ` pinskia at gcc dot gnu.org 2023-05-30 7:35 ` rguenth at gcc dot gnu.org 2024-03-10 3:37 ` law at gcc dot gnu.org 2024-03-22 13:45 ` law at gcc dot gnu.org
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