[PATCH 4.19 305/321] crypto: stm32/hash - Fix hmac issue more than 256 bytes

Greg Kroah-Hartman
2019-12-03T22:59:31Z

From: Lionel Debieve <lionel.debieve@st.com>

commit 0acabecebc912b3ba06289e4ef40476acc499a37 upstream.

Correct condition for the second hmac loop. Key must be only
set in the first loop. Initial condition was wrong,
HMAC_KEY flag was not properly checked.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/crypto/stm32/stm32-hash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -365,7 +365,7 @@ static int stm32_hash_xmit_cpu(struct st
return -ETIMEDOUT;

if ((hdev->flags & HASH_FLAGS_HMAC) &&
- (hdev->flags & ~HASH_FLAGS_HMAC_KEY)) {
+ (!(hdev->flags & HASH_FLAGS_HMAC_KEY))) {
hdev->flags |= HASH_FLAGS_HMAC_KEY;
stm32_hash_write_key(hdev);
if (stm32_hash_wait_busy(hdev))