sctp: add size validation when walking chunks

[ Upstream commit 50619dbf8db77e98d821d615af4f634d08e22698 ]

The first chunk in a packet is ensured to be present at the beginning of
sctp_rcv(), as a packet needs to have at least 1 chunk. But the second
one, may not be completely available and ch->length can be over
uninitialized memory.

Fix here is by only trying to walk on the next chunk if there is enough to
hold at least the header, and then proceed with the ch->length validation
that is already there.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/sctp/input.c b/net/sctp/input.c
index 7380f0a5949b8be3fdcd182d6658df02088a7bc7..1af35b69e99e9891945517519359e0a07aa91b33 100644 (file)
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -1197,7 +1197,7 @@ static struct sctp_association *__sctp_rcv_walk_lookup(struct net *net,
 
                ch = (struct sctp_chunkhdr *)ch_end;
                chunk_num++;
-       } while (ch_end < skb_tail_pointer(skb));
+       } while (ch_end + sizeof(*ch) < skb_tail_pointer(skb));
 
        return asoc;
 }