Commit fd2e9f82 authored by Thomas Weißschuh's avatar Thomas Weißschuh
Browse files

tools/nolibc: use __builtin_offsetof() 



The current custom implementation of offsetof() fails UBSAN:
runtime error: member access within null pointer of type 'struct ...'
This means that all its users, including container_of(), free() and
realloc(), fail.

Use __builtin_offsetof() instead which does not have this issue and
has been available since GCC 4 and clang 3.

Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Acked-by: default avatarWilly Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260401-nolibc-asprintf-v1-1-46292313439f@weissschuh.net
parent 867fb336

tools/include/nolibc/stddef.h

+1 −1
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ 
#endif



#ifndef offsetof

#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)

#define offsetof(TYPE, FIELD) __builtin_offsetof(TYPE, FIELD)

#endif



#endif /* _NOLIBC_STDDEF_H */