commit 692d0626557451c4b557397f20b7394b612d0289 Author: Christoph Hellwig <h...@lst.de> Date: Tue Sep 1 11:59:41 2020 +0200
block: fix locking in bdev_del_partition
[ Upstream commit 08fc1ab6d748ab1a690fd483f41e2938984ce353 ]
We need to hold the whole device bd_mutex to protect against
other thread concurrently deleting out partition before we get
to it, and thus causing a use after free.
Fixes: cddae808aeb7 ("block: pass a hd_struct to delete_partition")
Reported-by: syzbot+6448f3c229bc52b82...@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
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