Commit 0a8f72fa authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Greg Kroah-Hartman

stm class: Lose the protocol driver when dropping its reference

Commit c7fd62bc ("stm class: Introduce framing protocol drivers")
forgot to tear down the link between an stm device and its protocol
driver when policy is removed. This leads to an invalid pointer reference
if one tries to write to an stm device after the policy has been removed
and the protocol driver module unloaded, leading to the below splat:

> BUG: unable to handle page fault for address: ffffffffc0737068
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 3d780f067 P4D 3d780f067 PUD 3d7811067 PMD 492781067 PTE 0
> Oops: 0000 [#1] SMP NOPTI
> CPU: 1 PID: 26122 Comm: cat Not tainted 5.4.0-rc5+ #1
> RIP: 0010:stm_output_free+0x40/0xc0 [stm_core]
> Call Trace:
>  stm_char_release+0x3e/0x70 [stm_core]
>  __fput+0xc6/0x260
>  ____fput+0xe/0x10
>  task_work_run+0x9d/0xc0
>  exit_to_usermode_loop+0x103/0x110
>  do_syscall_64+0x19d/0x1e0
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fix this by tearing down the link from an stm device to its protocol
driver when the policy involving that driver is removed.
Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Fixes: c7fd62bc ("stm class: Introduce framing protocol drivers")
Reported-by: default avatarAmmy Yi <ammy.yi@intel.com>
Tested-by: default avatarAmmy Yi <ammy.yi@intel.com>
CC: stable@vger.kernel.org # v4.20+
Link: https://lore.kernel.org/r/20191114064201.43089-2-alexander.shishkin@linux.intel.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e9cb0497
......@@ -345,7 +345,11 @@ void stp_policy_unbind(struct stp_policy *policy)
stm->policy = NULL;
policy->stm = NULL;
/*
* Drop the reference on the protocol driver and lose the link.
*/
stm_put_protocol(stm->pdrv);
stm->pdrv = NULL;
stm_put_device(stm);
}
......
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