linux-kernel - [PATCH AUTOSEL 6.8 18/30] kselftest: arm64: Add a null pointer check

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Date: Mon, 27 May 2024 10:13:27 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kunwu Chan <chentao@...inos.cn>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>,
	Will Deacon <will@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	catalin.marinas@....com,
	shuah@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 6.8 18/30] kselftest: arm64: Add a null pointer check

From: Kunwu Chan <chentao@...inos.cn>

[ Upstream commit 80164282b3620a3cb73de6ffda5592743e448d0e ]

There is a 'malloc' call, which can be unsuccessful.
This patch will add the malloc failure checking
to avoid possible null dereference and give more information
about test fail reasons.

Signed-off-by: Kunwu Chan <chentao@...inos.cn>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
Link: https://lore.kernel.org/r/20240423082102.2018886-1-chentao@kylinos.cn
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/arm64/tags/tags_test.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/arm64/tags/tags_test.c b/tools/testing/selftests/arm64/tags/tags_test.c
index 5701163460ef7..955f87c1170d7 100644
--- a/tools/testing/selftests/arm64/tags/tags_test.c
+++ b/tools/testing/selftests/arm64/tags/tags_test.c
@@ -6,6 +6,7 @@
 #include <stdint.h>
 #include <sys/prctl.h>
 #include <sys/utsname.h>
+#include "../../kselftest.h"
 
 #define SHIFT_TAG(tag)		((uint64_t)(tag) << 56)
 #define SET_TAG(ptr, tag)	(((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \
@@ -21,6 +22,9 @@ int main(void)
 	if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0)
 		tbi_enabled = 1;
 	ptr = (struct utsname *)malloc(sizeof(*ptr));
+	if (!ptr)
+		ksft_exit_fail_msg("Failed to allocate utsname buffer\n");
+
 	if (tbi_enabled)
 		tag = 0x42;
 	ptr = (struct utsname *)SET_TAG(ptr, tag);
-- 
2.43.0