diff options
| author | Matthew Daley <mattjd@gmail.com> | 2011-10-14 18:45:05 +0000 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2012-08-17 15:35:24 -0400 |
| commit | 634a1a9359529a289f764a26911eb1a5a3b85a42 (patch) | |
| tree | 47d0282bc13e3c868217c0e59d9fe648c3290c23 /net | |
| parent | db9ef6e22cbfff5726fccdf509ae9581aa069a0b (diff) | |
x25: Prevent skb overreads when checking call user data
commit 7f81e25befdfb3272345a2e775f520e1d515fa20 upstream.
x25_find_listener does not check that the amount of call user data given
in the skb is big enough in per-socket comparisons, hence buffer
overreads may occur. Fix this by adding a check.
Signed-off-by: Matthew Daley <mattjd@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andrew Hendry <andrew.hendry@gmail.com>
Acked-by: Andrew Hendry <andrew.hendry@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/x25/af_x25.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 36e84e13c6a..3117b9ea50c 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -296,7 +296,8 @@ static struct sock *x25_find_listener(struct x25_address *addr, * Found a listening socket, now check the incoming * call user data vs this sockets call user data */ - if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { + if (x25_sk(s)->cudmatchlength > 0 && + skb->len >= x25_sk(s)->cudmatchlength) { if((memcmp(x25_sk(s)->calluserdata.cuddata, skb->data, x25_sk(s)->cudmatchlength)) == 0) { |