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authorAndre Guedes <andre.guedes@openbossa.org>2012-05-31 17:01:34 -0300
committerJohan Hedberg <johan.hedberg@intel.com>2012-06-05 06:34:15 +0300
commit682877c31fc1b6510b694b6b8e78d8dde53a47cc (patch)
treef1b042c56fa7c6d61026fafa7d2f90478c26c910 /net/bluetooth/l2cap_sock.c
parent6fcb06a28d150095f042c477fbe20a9767d9a951 (diff)
Bluetooth: Check MTU value in l2cap_sock_setsockopt_old
If user tries to set an invalid MTU value, l2cap_sock_setsockopt_old should return -EINVAL. Signed-off-by: Andre Guedes <andre.guedes@openbossa.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Diffstat (limited to 'net/bluetooth/l2cap_sock.c')
-rw-r--r--net/bluetooth/l2cap_sock.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index d856cc8f22a3..ab5868d94307 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -445,6 +445,22 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, ch
return err;
}
+static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
+{
+ switch (chan->scid) {
+ case L2CAP_CID_LE_DATA:
+ if (mtu < L2CAP_LE_DEFAULT_MTU)
+ return false;
+ break;
+
+ default:
+ if (mtu < L2CAP_DEFAULT_MIN_MTU)
+ return false;
+ }
+
+ return true;
+}
+
static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
@@ -483,6 +499,11 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __us
break;
}
+ if (!l2cap_valid_mtu(chan, opts.imtu)) {
+ err = -EINVAL;
+ break;
+ }
+
chan->mode = opts.mode;
switch (chan->mode) {
case L2CAP_MODE_BASIC: