sctp: fix the panic caused by route update

[ Upstream commit ecc515d7238f2cffac839069d56dc271141defa0 ]

Commit 7303a1475008 ("sctp: identify chunks that need to be fragmented
at IP level") made the chunk be fragmented at IP level in the next round
if it's size exceed PMTU.

But there still is another case, PMTU can be updated if transport's dst
expires and transport's pmtu_pending is set in sctp_packet_transmit. If
the new PMTU is less than the chunk, the same issue with that commit can
be triggered.

So we should drop this packet and let it retransmit in another round
where it would be fragmented at IP level.

This patch is to fix it by checking the chunk size after PMTU may be
updated and dropping this packet if it's size exceed PMTU.

Fixes: 90017accff61 ("sctp: Add GSO support")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@txudriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sctp/output.c b/net/sctp/output.c
index 31b7bc35895d578d37fee79a8a56a074f43932fe..81929907a365da63ffb3390624d34825ffa84a23 100644 (file)
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -417,6 +417,7 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
        __u8 has_data = 0;
        int gso = 0;
        int pktcount = 0;
+       int auth_len = 0;
        struct dst_entry *dst;
        unsigned char *auth = NULL;     /* pointer to auth in skb data */
 
@@ -505,7 +506,12 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
                        list_for_each_entry(chunk, &packet->chunk_list, list) {
                                int padded = WORD_ROUND(chunk->skb->len);
 
-                               if (pkt_size + padded > tp->pathmtu)
+                               if (chunk == packet->auth)
+                                       auth_len = padded;
+                               else if (auth_len + padded + packet->overhead >
+                                        tp->pathmtu)
+                                       goto nomem;
+                               else if (pkt_size + padded > tp->pathmtu)
                                        break;
                                pkt_size += padded;
                        }