This is a note to let you know that I've just added the patch titled
dm btree remove: fix use after free in rebalance_children()
to the 5.4-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-btree-remove-fix-use-after-free-in-rebalance_children.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1b8d2789dad0005fd5e7d35dab26a8e1203fb6da Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@xxxxxxxxxx>
Date: Wed, 24 Nov 2021 12:07:39 -0500
Subject: dm btree remove: fix use after free in rebalance_children()
From: Joe Thornber <ejt@xxxxxxxxxx>
commit 1b8d2789dad0005fd5e7d35dab26a8e1203fb6da upstream.
Move dm_tm_unlock() after dm_tm_dec().
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/persistent-data/dm-btree-remove.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/persistent-data/dm-btree-remove.c
+++ b/drivers/md/persistent-data/dm-btree-remove.c
@@ -423,9 +423,9 @@ static int rebalance_children(struct sha
memcpy(n, dm_block_data(child),
dm_bm_block_size(dm_tm_get_bm(info->tm)));
- dm_tm_unlock(info->tm, child);
dm_tm_dec(info->tm, dm_block_location(child));
+ dm_tm_unlock(info->tm, child);
return 0;
}
Patches currently in stable-queue which might be from ejt@xxxxxxxxxx are
queue-5.4/dm-btree-remove-fix-use-after-free-in-rebalance_children.patch
