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crypto: stm32 - fix loop iterating through scatterlist for DMA

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commit d9c83f71ee upstream.

We were reading the length of the scatterlist sg after copying value of
tsg inside.
So we are using the size of the previous scatterlist and for the first
one we are using an unitialised value.
Fix this by copying tsg in sg[0] before reading the size.

Fixes : 8a1012d3f2 ("crypto: stm32 - Support for STM32 HASH module")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Bourgoin 2023-07-13 17:15:15 +02:00 committed by Greg Kroah-Hartman
parent 9ab2c149c2
commit cb65ad51f1
1 changed files with 1 additions and 1 deletions
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2
drivers/crypto/stm32/stm32-hash.c
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@ -565,9 +565,9 @@ static int stm32_hash_dma_send(struct stm32_hash_dev *hdev)
}
for_each_sg(rctx->sg, tsg, rctx->nents, i) {
sg[0] = *tsg;
len = sg->length;
sg[0] = *tsg;
if (sg_is_last(sg)) {
if (hdev->dma_mode == 1) {
len = (ALIGN(sg->length, 16) - 16);