[PATCH 2/8] crypto:chcr- Fix key length for RFC4106

[Harsh Jain]

Check keylen before copying salt to avoid wrap around of Integer.

Signed-off-by: Harsh Jain <ha...@chelsio.com>
---
 drivers/crypto/chelsio/chcr_algo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_algo.c 
b/drivers/crypto/chelsio/chcr_algo.c
index deec7c0..6c2dea3 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -2194,8 +2194,8 @@ static int chcr_gcm_setkey(struct crypto_aead *aead, 
const u8 *key,
        unsigned int ck_size;
        int ret = 0, key_ctx_size = 0;
 
-       if (get_aead_subtype(aead) ==
-           CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106) {
+       if (get_aead_subtype(aead) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106 &&
+           keylen > 3) {
                keylen -= 4;  /* nonce/salt is present in the last 4 bytes */
                memcpy(aeadctx->salt, key + keylen, 4);
        }
-- 
1.8.2.3