https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104069
--- Comment #2 from Sergei Trofimovich <slyfox at gcc dot gnu.org> --- Similar code triggers the same warning (and error due to -Werror) on current linux.git: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/lib/subcmd/subcmd-util.h?id=0c947b893d69231a9add855939da7c66237ab44f#n50 static inline void *xrealloc(void *ptr, size_t size) { void *ret = realloc(ptr, size); if (!ret && !size) ret = realloc(ptr, 1); if (!ret) { ret = realloc(ptr, size); if (!ret && !size) ret = realloc(ptr, 1); if (!ret) die("Out of memory, realloc failed"); } return ret; } CC tools/objtool/help.o In file included from help.c:12: In function 'xrealloc', inlined from 'add_cmdname' at help.c:24:2: subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free] 56 | ret = realloc(ptr, size); | ^~~~~~~~~~~~~~~~~~ subcmd-util.h:52:21: note: call to 'realloc' here 52 | void *ret = realloc(ptr, size); | ^~~~~~~~~~~~~~~~~~ subcmd-util.h:58:31: error: pointer may be used after 'realloc' [-Werror=use-after-free] 58 | ret = realloc(ptr, 1); | ^~~~~~~~~~~~~~~ subcmd-util.h:52:21: note: call to 'realloc' here 52 | void *ret = realloc(ptr, size); | ^~~~~~~~~~~~~~~~~~
