swrap: Add an overflow check

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

diff --git a/src/socket_wrapper.c b/src/socket_wrapper.c
index df70df5008d86dbac9aa759adba3c412d2d24550..a0e1df044a6d7b8f02af99e6f9317cb76a9af624 100644 (file)
--- a/src/socket_wrapper.c
+++ b/src/socket_wrapper.c
@@ -4752,6 +4752,11 @@ static ssize_t swrap_sendmsg_before(int fd,
                for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
                        size_t nlen;
                        nlen = len + msg->msg_iov[i].iov_len;
+                       if (nlen < len) {
+                               /* overflow */
+                               errno = EMSGSIZE;
+                               goto out;
+                       }
                        if (nlen > mtu) {
                                break;
                        }