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dm table: fix dax_dev NULL dereference in device_synchronous() 

If a device doesn't support DAX its 'dax_dev' is NULL.  Fix
device_synchronous() to first check if dax_dev is NULL before
dereferencing it.

Fixes: 2e9ee0955d ("dm: enable synchronous dax")
Reported-by: jencce.kernel@gmail.com
Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Pankaj Gupta 2019-07-30 17:07:08 +05:30 committed by Mike Snitzer
parent 609488bc97
commit 5348deb138
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-table.c
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@ -894,7 +894,7 @@ int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
static int device_synchronous(struct dm_target *ti, struct dm_dev *dev, static int device_synchronous(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data) sector_t start, sector_t len, void *data)
{ {
return dax_synchronous(dev->dax_dev); return dev->dax_dev && dax_synchronous(dev->dax_dev);
} }
bool dm_table_supports_dax(struct dm_table *t, bool dm_table_supports_dax(struct dm_table *t,