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MD: fix a null dereference

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rdev->mddev could be null in start time.

Reported-by: Ming Lei <ming.lei@redhat.com>
Fix: 5a85071c2cbc(md: use a separate bio_set for synchronous IO.)
Cc: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li
2017-06-23 09:19:49 -07:00
parent 5a85071c2c
commit 7f053a6a74
1 changed files with 1 additions and 1 deletions
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drivers/md/md.c
+1 -1
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@@ -205,7 +205,7 @@ EXPORT_SYMBOL_GPL(bio_alloc_mddev);
static struct bio *md_bio_alloc_sync(struct mddev *mddev)
{
if (!mddev->sync_set)
if (!mddev || !mddev->sync_set)
return bio_alloc(GFP_NOIO, 1);
return bio_alloc_bioset(GFP_NOIO, 1, mddev->sync_set);