Re: [PATCH] crypto: mxs-dcp: handle zero-length skcipher requests

[Herbert Xu]

On Fri, Aug 28, 2026 at 05:32:09PM +0800, Linmao Li wrote:
> Zero-length skcipher requests are valid no-ops, but MXS-DCP queues them.
> When such a request reaches the worker, last_out_len remains zero. The
> CBC completion path then subtracts AES_BLOCK_SIZE from this unsigned
> value when updating the IV, causing the offset to underflow. On
> decryption, the resulting source address precedes aes_in_buf.
> 
> Return success before enqueueing zero-length requests. This avoids the
> invalid source access and leaves the IV unchanged for a no-op.
> 
> Fixes: fadd7a6e616b ("crypto: mxs-dcp - Fix AES issues")
> Signed-off-by: Linmao Li <lilinmao@xxxxxxxxxx>
> ---
>  drivers/crypto/mxs-dcp.c | 3 +++
>  1 file changed, 3 insertions(+)

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