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| author | Stefan Haberland <sth@linux.vnet.ibm.com> | 2017-01-25 16:56:41 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-01-31 10:47:25 +0100 |
| commit | ca732e111ff7017e79a0cbb8aa0636c6ce48eb7d (patch) | |
| tree | 7097bbd9bf7f90edefde0fed88ffdb8bcd582618 /drivers/s390 | |
| parent | 2202134e48a3b50320aeb9e3dd1186833e9d7e66 (diff) | |
| download | linux-ca732e111ff7017e79a0cbb8aa0636c6ce48eb7d.tar.gz linux-ca732e111ff7017e79a0cbb8aa0636c6ce48eb7d.tar.xz | |
s390/dasd: check blockdevice pointer before trying to sync blockdevice
If safe offline is called for a DASD alias device a null pointer is passed
to fsync_bdev. So check for existence of the blockdevice before calling
fsync_bdev.
Should not be a real world problem since safe offline for an alias device
does not make sense and fsync_bdev can deal with a NULL pointer which it
gets after successful NULL pointer dereferencing on s390.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/dasd.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index f3099c8cc143..6fb3fd5efc11 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -3601,10 +3601,11 @@ int dasd_generic_set_offline(struct ccw_device *cdev) * empty */ /* sync blockdev and partitions */ - rc = fsync_bdev(device->block->bdev); - if (rc != 0) - goto interrupted; - + if (device->block) { + rc = fsync_bdev(device->block->bdev); + if (rc != 0) + goto interrupted; + } /* schedule device tasklet and wait for completion */ dasd_schedule_device_bh(device); rc = wait_event_interruptible(shutdown_waitq, |