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 --- Changes in v2: Use EXIT_FAILURE instead of -1. --- 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..e597861b26d6 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