From d9c83f71eeceed2cb54bb78be84f2d4055fd9a1f Mon Sep 17 00:00:00 2001
From: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Date: Thu, 13 Jul 2023 17:15:15 +0200
Subject: [PATCH] crypto: stm32 - fix loop iterating through scatterlist for DMA
Git-commit: d9c83f71eeceed2cb54bb78be84f2d4055fd9a1f
Patch-mainline: v6.6-rc1
References: git-fixes
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 : 8a1012d3f2ab ("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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/crypto/stm32/stm32-hash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index c179a6c1a457..519fb716acee 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -678,9 +678,9 @@ 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);
--
2.35.3