crypto: chelsio - check set_msg_len overflow in generate_b0

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

Fixes: 2debd332 ("crypto: chcr - Add AEAD algos.")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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;