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| 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 | |
| parent | 03ba999117eb8688252f9068356b6e028c2c3a56 (diff) | |
| download | linux-83e0bbcbe2145f160fbaa109b0439dae7f4a38a9.tar.gz linux-83e0bbcbe2145f160fbaa109b0439dae7f4a38a9.tar.bz2 linux-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>
| -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 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; diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c index 650139626581..0f36e8d59b29 100644 --- a/net/rose/af_rose.c +++ b/net/rose/af_rose.c @@ -1124,6 +1124,10 @@ 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 9ca17b1ce52e..ed80af8ca5fb 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -1035,6 +1035,12 @@ 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 */ |