diff options
| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2016-01-17 12:25:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-06 22:12:56 -0800 |
| commit | 7326fffb712f09a315bc73cc1ee63843f59b8bd4 (patch) | |
| tree | 5f542b8e6172be47df34e28ab2b18c61064b4971 /drivers/misc | |
| parent | 92e963f50fc74041b5e9e744c330dca48e04f08d (diff) | |
| download | linux-7326fffb712f09a315bc73cc1ee63843f59b8bd4.tar.bz2 | |
mei: validate request value in client notify request ioctl
This patch address a possible security issue:
The request field in client notify request ioctl comes from user space
as u32 and is downcasted to u8 with out validation.
Check request field to have approved values
MEI_HBM_NOTIFICATION_STAR/STOP
Cc: <stable@vger.kernel.org> #4.3+
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mei/main.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index 677d0362f334..80f9afcb1382 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -458,7 +458,11 @@ static int mei_ioctl_client_notify_request(struct file *file, u32 request) { struct mei_cl *cl = file->private_data; - return mei_cl_notify_request(cl, file, request); + if (request != MEI_HBM_NOTIFICATION_START && + request != MEI_HBM_NOTIFICATION_STOP) + return -EINVAL; + + return mei_cl_notify_request(cl, file, (u8)request); } /** |