Re: [PATCH] crypto: tcrypt: clamp num_mb to avoid divide-by-zero

[Herbert Xu]

On Mon, Mar 02, 2026 at 03:59:14PM -0800, Saeed Mirzamohammadi wrote:
> 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@xxxxxxxxxx>
> ---
>  crypto/tcrypt.c | 5 +++++
>  1 file changed, 5 insertions(+)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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