linux-kernel - [PATCH] selftests: arm64: Check fread return value in exec

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Message-ID: <20250807154950.24105-1-reddybalavignesh9979@gmail.com>
Date: Thu,  7 Aug 2025 21:19:47 +0530
From: Bala-Vignesh-Reddy <reddybalavignesh9979@...il.com>
To: catalin.marinas@....com,
	will@...nel.org,
	shuah@...nel.org,
	broonie@...nel.org
Cc: Bala-Vignesh-Reddy <reddybalavignesh9979@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: arm64: Check fread return value in exec_target

Fix -Wunused-result warning generated when compiled with gcc 13.3.0,
by checking fread's return value and handling errors, preventing
potential failures when reading from stdin.

Fixes compiler warning:
warning: ignoring return value of 'fread' declared with attribute
'warn_unused_result' [-Wunused-result]

Fixes: 806a15b2545e ("kselftests/arm64: add PAuth test for whether exec() changes keys")

Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@...il.com>
---
 tools/testing/selftests/arm64/pauth/exec_target.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/arm64/pauth/exec_target.c b/tools/testing/selftests/arm64/pauth/exec_target.c
index 4435600ca400..c22db59194eb 100644
--- a/tools/testing/selftests/arm64/pauth/exec_target.c
+++ b/tools/testing/selftests/arm64/pauth/exec_target.c
@@ -13,7 +13,12 @@ int main(void)
 	unsigned long hwcaps;
 	size_t val;
 
-	fread(&val, sizeof(size_t), 1, stdin);
+	size_t size = fread(&val, sizeof(size_t), 1, stdin);
+
+	if (size != 1) {
+		fprintf(stderr, "Could not read input from stdin\n");
+		return -1;
+	}
 
 	/* don't try to execute illegal (unimplemented) instructions) caller
 	 * should have checked this and keep worker simple
-- 
2.43.0