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crypto: mxs-dcp - Ensure payload is zero when using key slot

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We could leak stack memory through the payload field when running
AES with a key from one of the hardware's key slots. Fix this by
ensuring the payload field is set to 0 in such cases.

This does not affect the common use case when the key is supplied
from main memory via the descriptor payload.

Signed-off-by: David Gstir <david@sigma-star.at>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202405270146.Y9tPoil8-lkp@intel.com/
Fixes: 3d16af0b4c ("crypto: mxs-dcp: Add support for hardware-bound keys")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
David Gstir 2024-07-03 14:49:58 +02:00 committed by Herbert Xu
parent addea5858b
commit dd52b5eeb0
1 changed files with 2 additions and 1 deletions
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3
drivers/crypto/mxs-dcp.c
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@ -225,7 +225,8 @@ static int mxs_dcp_start_dma(struct dcp_async_ctx *actx)
static int mxs_dcp_run_aes(struct dcp_async_ctx *actx,
struct skcipher_request *req, int init)
{
dma_addr_t key_phys, src_phys, dst_phys;
dma_addr_t key_phys = 0;
dma_addr_t src_phys, dst_phys;
struct dcp *sdcp = global_sdcp;
struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
struct dcp_aes_req_ctx *rctx = skcipher_request_ctx(req);