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crypto: tcrypt - clamp num_mb to avoid divide-by-zero

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Passing num_mb=0 to the multibuffer speed tests leaves test_mb_aead_cycles()
and test_mb_acipher_cycles() dividing by (8 * num_mb). With sec=0 (the
default), the module prints "1 operation in ..." and hits a divide-by-zero
fault.

Force num_mb to at least 1 during module init and warn the caller so the
warm-up loop and the final report stay well-defined.

To reproduce:
sudo modprobe tcrypt mode=600 num_mb=0

Signed-off-by: Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Saeed Mirzamohammadi
2026-03-02 15:59:14 -08:00
committed by Herbert Xu
parent 3ac9498813
commit 32e76e3757
1 changed files with 5 additions and 0 deletions
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5
crypto/tcrypt.c
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@@ -2808,6 +2808,11 @@ static int __init tcrypt_mod_init(void)
goto err_free_tv;
}
if (!num_mb) {
pr_warn("num_mb must be at least 1; forcing to 1\n");
num_mb = 1;
}
err = do_test(alg, type, mask, mode, num_mb);
if (err) {