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Subject[patch 02/16] USB: cdc-acm: dont unlock acm->mutex on error path
2.6.25-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Alexey Dobriyan <adobriyan@gmail.com>
commit 74573ee7096a4ffc2f098108d21c85801b9c7434 upstream

On Wed, Jul 23, 2008 at 03:52:36PM +0300, Andrei Popa wrote:
> I installed gnokii-0.6.22-r2 and gave the command "gnokii --identify"
> and the kernel oopsed:
>
> BUG: unable to handle kernel NULL pointer dereference at 00000458
> IP: [<c0444b52>] mutex_unlock+0x0/0xb
> [<c03830ae>] acm_tty_open+0x4c/0x214

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Tested-by: Andrei Popa <andrei.popa@i-neo.ro>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/usb/class/cdc-acm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -531,8 +531,8 @@ static int acm_tty_open(struct tty_struc
tasklet_schedule(&acm->urb_task);

done:
-err_out:
mutex_unlock(&acm->mutex);
+err_out:
mutex_unlock(&open_mutex);
return rv;

--


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