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mei: protect mei_cl_mtu from null dereference

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commit bcbc0b2e275f0a797de11a10eff495b4571863fc upstream.

A receive callback is queued while the client is still connected
but can still be called after the client was disconnected. Upon
disconnect cl->me_cl is set to NULL, hence we need to check
that ME client is not-NULL in mei_cl_mtu to avoid
null dereference.

Cc: <[email protected]>
Signed-off-by: Alexander Usyskin <[email protected]>
Signed-off-by: Tomas Winkler <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Alexander Usyskin 2020-10-29 11:54:42 +02:00 • committed by Greg Kroah-Hartman
commit 761fb68292
1 changed files with 2 additions and 2 deletions
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4
drivers/misc/mei/client.h
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@ -128,11 +128,11 @@ static inline u8 mei_cl_me_id(const struct mei_cl *cl)
*
* @cl: host client
*
* Return: mtu
* Return: mtu or 0 if client is not connected
*/
static inline size_t mei_cl_mtu(const struct mei_cl *cl)
{
return cl->me_cl->props.max_msg_length;
return cl->me_cl ? cl->me_cl->props.max_msg_length : 0;
}
/**