Re: [PATCH] crypto: mxs-dcp: handle zero-length skcipher requests
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2026-09-11 05:29:44
Also in:
imx, linux-crypto, lkml
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 <redacted>
---
drivers/crypto/mxs-dcp.c | 3 +++
1 file changed, 3 insertions(+)Patch applied. Thanks. -- Email: Herbert Xu [off-list ref] Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt