6.6-stable review patch. If anyone has any objections, please let me know.
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From: Bala-Vignesh-Reddy reddybalavignesh9979@gmail.com
[ 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: 806a15b2545e ("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 --- 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 4435600ca400d..e597861b26d6b 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 EXIT_FAILURE; + }
/* don't try to execute illegal (unimplemented) instructions) caller * should have checked this and keep worker simple