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* [glibc] socket: Use offsetof in SUN_LEN (bug 29578)
@ 2022-10-10 7:32 Andreas Schwab
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From: Andreas Schwab @ 2022-10-10 7:32 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c15318bfc5499d835c434a4d98b688aa2d928412
commit c15318bfc5499d835c434a4d98b688aa2d928412
Author: Andreas Schwab <schwab@suse.de>
Date: Mon Sep 19 10:10:09 2022 +0200
socket: Use offsetof in SUN_LEN (bug 29578)
Use offsetof instead of its traditional expansion in the definition of the
SUN_LEN macro, to avoid a warning from the undefined behaviour sanitizer.
Diff:
---
socket/sys/un.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/socket/sys/un.h b/socket/sys/un.h
index 454eafebc9..2b11300e28 100644
--- a/socket/sys/un.h
+++ b/socket/sys/un.h
@@ -34,10 +34,11 @@ struct sockaddr_un
#ifdef __USE_MISC
+# include <stddef.h>
# include <string.h> /* For prototype of `strlen'. */
/* Evaluate to actual length of the `sockaddr_un' structure. */
-# define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+# define SUN_LEN(ptr) (offsetof (struct sockaddr_un, sun_path) \
+ strlen ((ptr)->sun_path))
#endif
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2022-10-10 7:32 [glibc] socket: Use offsetof in SUN_LEN (bug 29578) Andreas Schwab
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