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crypto: img-hash - Fix variable dereferenced before check 'hdev->req'

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[ Upstream commit 04ba54e5af ]

Smatch report warning as follows:

drivers/crypto/img-hash.c:366 img_hash_dma_task() warn: variable
dereferenced before check 'hdev->req'

Variable dereferenced should be done after check 'hdev->req',
fix it.

Fixes: d358f1abbf ("crypto: img-hash - Add Imagination Technologies hw hash accelerator")
Fixes: 10badea259 ("crypto: img-hash - Fix null pointer exception")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gaosheng Cui
2022-12-01 14:25:26 +08:00
committed by Greg Kroah-Hartman
parent 15ca148940
commit 38da26c855
1 changed files with 6 additions and 2 deletions
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8
drivers/crypto/img-hash.c
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@@ -357,12 +357,16 @@ static int img_hash_dma_init(struct img_hash_dev *hdev)
static void img_hash_dma_task(unsigned long d) static void img_hash_dma_task(unsigned long d)
{ {
struct img_hash_dev *hdev = (struct img_hash_dev *)d; struct img_hash_dev *hdev = (struct img_hash_dev *)d;
struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req); struct img_hash_request_ctx *ctx;
u8 *addr; u8 *addr;
size_t nbytes, bleft, wsend, len, tbc; size_t nbytes, bleft, wsend, len, tbc;
struct scatterlist tsg; struct scatterlist tsg;
if (!hdev->req || !ctx->sg) if (!hdev->req)
return;
ctx = ahash_request_ctx(hdev->req);
if (!ctx->sg)
return; return;
addr = sg_virt(ctx->sg); addr = sg_virt(ctx->sg);