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dm btree remove: fix use after free in rebalance_children()

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commit 1b8d2789da upstream.

Move dm_tm_unlock() after dm_tm_dec().

Cc: stable@vger.kernel.org
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joe Thornber 2021-11-24 12:07:39 -05:00 committed by Greg Kroah-Hartman
parent 09cdb8aa59
commit 607beb420b
1 changed files with 1 additions and 1 deletions
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2
drivers/md/persistent-data/dm-btree-remove.c
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@ -423,9 +423,9 @@ static int rebalance_children(struct shadow_spine *s,
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;
}