[PATCH -next] crypto: chelsio - check set_msg_len overflow in generate_b0

[YueHaibing]

set_msg_len may fails with -EOVERFLOW, It should be propagate
to upstream.

Fixes: 2debd3325e55 ("crypto: chcr - Add AEAD algos.")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/crypto/chelsio/chcr_algo.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_algo.c 
b/drivers/crypto/chelsio/chcr_algo.c
index bcef765..bdbdce9 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -2762,7 +2762,7 @@ static int set_msg_len(u8 *block, unsigned int msglen, 
int csize)
        return 0;
 }
 
-static void generate_b0(struct aead_request *req, u8 *ivptr,
+static int generate_b0(struct aead_request *req, u8 *ivptr,
                        unsigned short op_type)
 {
        unsigned int l, lp, m;
@@ -2787,6 +2787,8 @@ static void generate_b0(struct aead_request *req, u8 
*ivptr,
        rc = set_msg_len(b0 + 16 - l,
                         (op_type == CHCR_DECRYPT_OP) ?
                         req->cryptlen - m : req->cryptlen, l);
+
+       return rc;
 }
 
 static inline int crypto_ccm_check_iv(const u8 *iv)
@@ -2821,7 +2823,7 @@ static int ccm_format_packet(struct aead_request *req,
                *((unsigned short *)(reqctx->scratch_pad + 16)) =
                                htons(assoclen);
 
-       generate_b0(req, ivptr, op_type);
+       rc = generate_b0(req, ivptr, op_type);
        /* zero the ctr value */
        memset(ivptr + 15 - ivptr[0], 0, ivptr[0] + 1);
        return rc;
-- 
2.7.0