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authorAl Viro <viro@zeniv.linux.org.uk>2007-07-29 00:15:18 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-31 02:28:06 -0700
commit6dc0c2082b8acf30c9239fbbcc051eebdaf7ecff (patch)
tree709bc082b259b1a0bf2dfbc6a5aee4a7aaf343de
parent09c7d8293a2d1317d16ef4ddb9f6dd2553d0694e (diff)
downloadlinux-6dc0c2082b8acf30c9239fbbcc051eebdaf7ecff.tar.bz2
[BLUETOOTH]: Fix endianness bug in l2cap_sock_listen()
We loop through psm values, calling __l2cap_get_sock_by_addr(psm, ...) until we get NULL; then we set ->psm of our socket to htobs(psm). IOW, we find unused psm value and put it into our socket. So far, so good, but... __l2cap_get_sock_by_addr() compares its argument with ->psm of sockets. IOW, the entire thing works correctly only on little-endian. On big-endian we'll get "no socket with such psm" on the first iteration, since we won't find a socket with ->psm == 0x1001. We will happily conclude that 0x1001 is unused and slap htobs(0x1001) (i.e. 0x110) into ->psm of our socket. Of course, the next time around the same thing will repeat and we'll just get a fsckload of sockets with the same ->psm assigned. Fix: pass htobs(psm) to __l2cap_get_sock_by_addr() there. All other callers are already passing little-endian values and all places that store something in ->psm are storing little-endian. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/bluetooth/l2cap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 670ff95ca64b..b82cbdd1fcb1 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -748,7 +748,7 @@ static int l2cap_sock_listen(struct socket *sock, int backlog)
write_lock_bh(&l2cap_sk_list.lock);
for (psm = 0x1001; psm < 0x1100; psm += 2)
- if (!__l2cap_get_sock_by_addr(psm, src)) {
+ if (!__l2cap_get_sock_by_addr(htobs(psm), src)) {
l2cap_pi(sk)->psm = htobs(psm);
l2cap_pi(sk)->sport = htobs(psm);
err = 0;