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 <[email protected]>
---
net/bluetooth/l2cap.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 670ff95..b82cbdd 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;
--
1.5.3.GIT
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