diff options
| author | Vineeth Vijayan <vneethv@linux.ibm.com> | 2022-02-02 23:45:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-16 14:56:38 +0300 |
| commit | fe990b7bf6ac93f1d850d076b8f0e758268aa4ab (patch) | |
| tree | 0de3ebbf76953018257d2fc2254ad29e45a6eaca /drivers/s390 | |
| parent | 56ca18dd5483a7056b83f277dd90a5db382191ab (diff) | |
| download | linux-fe990b7bf6ac93f1d850d076b8f0e758268aa4ab.tar.xz | |
s390/cio: verify the driver availability for path_event call
commit dd9cb842fa9d90653a9b48aba52f89c069f3bc50 upstream.
If no driver is attached to a device or the driver does not provide the
path_event function, an FCES path-event on this device could end up in a
kernel-panic. Verify the driver availability before the path_event
function call.
Fixes: 32ef938815c1 ("s390/cio: Add support for FCES status notification")
Cc: stable@vger.kernel.org
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Suggested-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/device.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 8d14569823d7..61cde02b23fe 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -1194,7 +1194,7 @@ static int io_subchannel_chp_event(struct subchannel *sch, else path_event[chpid] = PE_NONE; } - if (cdev) + if (cdev && cdev->drv && cdev->drv->path_event) cdev->drv->path_event(cdev, path_event); break; } |