[PATCH net-next] sctp: fix error return code in sctp_sendmsg_new_asoc()

[Wei Yongjun <weiyongjun1@huawei.com>]

Return error code -EINVAL in the address len check error handling
case since 'err' can be overwrite to 0 by 'err = sctp_verify_addr()'
in the for loop.

Fixes: 2c0dbaa0c43d ("sctp: add support for SCTP_DSTADDRV4/6 Information for sendmsg")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
---
 net/sctp/socket.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 7d3476a..5e7bfc2 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1761,16 +1761,20 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
 		memset(daddr, 0, sizeof(*daddr));
 		dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
 		if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
-			if (dlen < sizeof(struct in_addr))
+			if (dlen < sizeof(struct in_addr)) {
+				err = -EINVAL;
 				goto free;
+			}
 
 			dlen = sizeof(struct in_addr);
 			daddr->v4.sin_family = AF_INET;
 			daddr->v4.sin_port = htons(asoc->peer.port);
 			memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
 		} else {
-			if (dlen < sizeof(struct in6_addr))
+			if (dlen < sizeof(struct in6_addr)) {
+				err = -EINVAL;
 				goto free;
+			}
 
 			dlen = sizeof(struct in6_addr);
 			daddr->v6.sin6_family = AF_INET6;