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dm rq: cope with DM device destruction while in dm_old_request_fn()

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Fixes a crash in dm_table_find_target() due to a NULL struct dm_table
being passed from dm_old_request_fn() that races with DM device
destruction.

Reported-by: artem@flashgrid.io
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Mike Snitzer
2017-01-25 16:24:52 +01:00
parent d19a55ccad
commit 4087a1fffe
1 changed files with 4 additions and 0 deletions
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drivers/md/dm-rq.c
+4
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@@ -779,6 +779,10 @@ static void dm_old_request_fn(struct request_queue *q)
int srcu_idx;
struct dm_table *map = dm_get_live_table(md, &srcu_idx);
if (unlikely(!map)) {
dm_put_live_table(md, srcu_idx);
return;
}
ti = dm_table_find_target(map, pos);
dm_put_live_table(md, srcu_idx);
}