This is a note to let you know that I've just added the patch titled
selftests/nolibc: avoid passing NULL to printf("%s")
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-nolibc-avoid-passing-null-to-printf-s.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b1fc6bfdf11212de38eff0c344da59a82ef84a34
Author: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Date: Wed Aug 7 23:51:44 2024 +0200
selftests/nolibc: avoid passing NULL to printf("%s")
[ Upstream commit f1a58f61d88642ae1e6e97e9d72d73bc70a93cb8 ]
Clang on higher optimization levels detects that NULL is passed to
printf("%s") and warns about it.
While printf() from nolibc gracefully handles that NULL,
it is undefined behavior as per POSIX, so the warning is reasonable.
Avoid the warning by transforming NULL into a non-NULL placeholder.
Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Acked-by: Willy Tarreau <w@xxxxxx>
Link: https://lore.kernel.org/r/20240807-nolibc-llvm-v2-8-c20f2f5fc7c2@xxxxxxxxxxxxxx
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 093d0512f4c57..8cbb51dca0cd6 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -542,7 +542,7 @@ int expect_strzr(const char *expr, int llen)
{
int ret = 0;
- llen += printf(" = <%s> ", expr);
+ llen += printf(" = <%s> ", expr ? expr : "(null)");
if (expr) {
ret = 1;
result(llen, FAIL);
@@ -561,7 +561,7 @@ int expect_strnz(const char *expr, int llen)
{
int ret = 0;
- llen += printf(" = <%s> ", expr);
+ llen += printf(" = <%s> ", expr ? expr : "(null)");
if (!expr) {
ret = 1;
result(llen, FAIL);
