This is a note to let you know that I've just added the patch titled
dm rq: cope with DM device destruction while in dm_old_request_fn()
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-rq-cope-with-dm-device-destruction-while-in-dm_old_request_fn.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4087a1fffe38106e10646606a27f10d40451862d Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Wed, 25 Jan 2017 16:24:52 +0100
Subject: dm rq: cope with DM device destruction while in dm_old_request_fn()
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 4087a1fffe38106e10646606a27f10d40451862d upstream.
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@xxxxxxxxxxxx
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-rq.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -804,6 +804,10 @@ static void dm_old_request_fn(struct req
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);
}
Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are
queue-4.9/dm-rq-cope-with-dm-device-destruction-while-in-dm_old_request_fn.patch
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