Arithmetic on null pointers is undefined behavior, spotted by C compiler
sanitizers such as with clang. The builtin offset of is available in all
recent compilers, so unconditionally use it as discussed for libbpf in:
https://lore.kernel.org/all/a0a26308-a1d7-a57c-727c-000652a5d246@xxxxxx/
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tracecmd/include/list.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tracecmd/include/list.h b/tracecmd/include/list.h
index cf9dd47e..fa0de6df 100644
--- a/tracecmd/include/list.h
+++ b/tracecmd/include/list.h
@@ -6,7 +6,7 @@
#ifndef __LIST_H
#define __LIST_H
-#define offset_of(type, field) (long)(&((type *)0)->field)
+#define offset_of(type, field) __builtin_offsetof(type, field)
#define container_of(p, type, field) (type *)((long)p - offset_of(type, field))
struct list_head {
--
2.35.1.616.g0bdcbb4464-goog
|