[PATCH] Fix NULL pointer dereference in isdn_tty_at_cout
The changes in the tty related code introduced wrong parenthesis in a if
condition in the isdn_tty_at_cout function. This caused access to index -1
in the dev->drv[] array. This patch change it back to the correct
condition from the previous versions.
Signed-off-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index f190a99..3936336 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -2359,8 +2359,8 @@
/* use queue instead of direct, if online and */
/* data is in queue or buffer is full */
- if ((info->online && tty_buffer_request_room(tty, l) < l) ||
- (!skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel]))) {
+ if (info->online && ((tty_buffer_request_room(tty, l) < l) ||
+ !skb_queue_empty(&dev->drv[info->isdn_driver]->rpqueue[info->isdn_channel]))) {
skb = alloc_skb(l, GFP_ATOMIC);
if (!skb) {
spin_unlock_irqrestore(&info->readlock, flags);