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selftests: arm64: Check fread return value in exec_target

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[ Upstream commit a679e5683d3eef22ca12514ff8784b2b914ebedc ]

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: 806a15b254 ("kselftests/arm64: add PAuth test for whether exec() changes keys")

Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bala-Vignesh-Reddy 2025-08-08 13:38:30 +05:30 committed by Greg Kroah-Hartman
parent 26243ef29a
commit 583f690401
1 changed files with 6 additions and 1 deletions
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7
tools/testing/selftests/arm64/pauth/exec_target.c
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@ -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 EXIT_FAILURE;
}
/* don't try to execute illegal (unimplemented) instructions) caller
* should have checked this and keep worker simple