On Wed, Aug 24, 2022 at 10:51:13PM +0200, Nick via Elfutils-devel wrote: > I try to compile elfutils on OpenWrt with the newest gcc 12.2.0 version. > However, it fails due to -Werror=use-after-free. A workaround is a patch > that I found on the mailinglist, to disable -Werror > (https://sourceware.org/legacy-ml/elfutils-devel/imported/msg00994.html) > I modified it to apply to newest elfutils version. The error with > elfutils 0.187 and gcc 12.2.0: > > In function 'bigger_buffer', > inlined from '__libdw_gunzip' at gzip.c:376:12: > gzip.c:98:9: error: pointer may be used after 'realloc' > [-Werror=use-after-free] > 98 | b = realloc (state->buffer, more -= 1024); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > gzip.c:96:13: note: call to 'realloc' here > 96 | char *b = realloc (state->buffer, more); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This warning is definitely wrong, looks like a regression in gcc, please report this to compiler people, otherwise they will never know they introduced a bug that needs fixing. -- ldv
