diff options
| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2009-03-27 00:28:21 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-27 00:28:21 -0700 |
| commit | 83e0bbcbe2145f160fbaa109b0439dae7f4a38a9 (patch) | |
| tree | de3f516afc1878914855c9393b1e08c698ac378c /net/netrom | |
| parent | 03ba999117eb8688252f9068356b6e028c2c3a56 (diff) | |
| download | lwn-83e0bbcbe2145f160fbaa109b0439dae7f4a38a9.tar.gz lwn-83e0bbcbe2145f160fbaa109b0439dae7f4a38a9.zip | |
af_rose/x25: Sanity check the maximum user frame size
Otherwise we can wrap the sizes and end up sending garbage.
Closes #10423
Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom')
| -rw-r--r-- | net/netrom/af_netrom.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index 6d9c58ec56ac..d1c16bbee932 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -1086,7 +1086,11 @@ static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); - /* Build a packet */ + /* Build a packet - the conventional user limit is 236 bytes. We can + do ludicrously large NetROM frames but must not overflow */ + if (len > 65536) + return -EMSGSIZE; + SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; |