From 83e0bbcbe2145f160fbaa109b0439dae7f4a38a9 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Fri, 27 Mar 2009 00:28:21 -0700 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/netrom/af_netrom.c | 6 +++++- net/rose/af_rose.c | 4 ++++ net/x25/af_x25.c | 6 ++++++ 3 files changed, 15 insertions(+), 1 deletion(-) diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index 6d9c58ec56a..d1c16bbee93 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 65013962658..0f36e8d59b2 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 9ca17b1ce52..ed80af8ca5f 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 */ -- 2.41.1