diff options
| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2009-03-27 00:28:21 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-05-02 10:24:04 -0700 |
| commit | e16cf6626bb2160fee3dfda596a2b1469486c585 (patch) | |
| tree | 4968c033e6396e8e9fedb25093882ba282fe7300 | |
| parent | cf42ed344ad0d6c0fc12e29b817823af106b4720 (diff) | |
af_rose/x25: Sanity check the maximum user frame size
upstream commit: 83e0bbcbe2145f160fbaa109b0439dae7f4a38a9
CVE-2009-0795.
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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | net/netrom/af_netrom.c | 6 | ||||
| -rw-r--r-- | net/rose/af_rose.c | 4 | ||||
| -rw-r--r-- | net/x25/af_x25.c | 6 |
3 files changed, 15 insertions, 1 deletions
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index 9f1ea4a27b3..24da05040fd 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -1082,7 +1082,11 @@ 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; diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c index a7f1ce11bc2..c0623619202 100644 --- a/net/rose/af_rose.c +++ b/net/rose/af_rose.c @@ -1120,6 +1120,10 @@ static int rose_sendmsg(struct kiocb *iocb, struct socket *sock, /* Build a packet */ SOCK_DEBUG(sk, "ROSE: sendto: building packet.\n"); + /* Sanity check the packet size */ + if (len > 65535) + return -EMSGSIZE; + size = len + AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 9fc5b023d11..88d80f55fac 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -1037,6 +1037,12 @@ static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, sx25.sx25_addr = x25->dest_addr; } + /* Sanity check the packet size */ + if (len > 65535) { + rc = -EMSGSIZE; + goto out; + } + SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); /* Build a packet */ |