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| author |   Alexander Usyskin <alexander.usyskin@intel.com> | 2020-10-29 11:54:42 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-03 10:13:48 +0100 |
| commit | bcbc0b2e275f0a797de11a10eff495b4571863fc (patch) | |
| tree | 4b5c88280d4194ac1ce38394bd943ccf623ac0b8 /drivers/misc/mei | |
| parent | Linux 5.10-rc2 (diff) | |
| download | linux-dev-bcbc0b2e275f0a797de11a10eff495b4571863fc.tar.xz linux-dev-bcbc0b2e275f0a797de11a10eff495b4571863fc.zip | |
mei: protect mei_cl_mtu from null dereference
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: <stable@vger.kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20201029095444.957924-2-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei')
| -rw-r--r-- | drivers/misc/mei/client.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h index 64143d4ec758..9e08a9843bba 100644 --- a/drivers/misc/mei/client.h +++ b/drivers/misc/mei/client.h @@ -182,11 +182,11 @@ 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; } /** |