net/bluetooth/rfcomm/tty.c: use-after-free

[Adrian Bunk <bunk@stusta.de>]

Commit 8de0a15483b357d0f0b821330ec84d1660cadc4e added the following 
use-after-free in net/bluetooth/rfcomm/tty.c:

<--  snip  -->

...
static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
{
...
        if (IS_ERR(dev->tty_dev)) {
                list_del(&dev->list);
                kfree(dev);
                return PTR_ERR(dev->tty_dev);
        }
...

<--  snip  -->

Spotted by the Coverity checker.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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