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btrfs: don't prematurely free work in scrub_missing_raid56_worker() 

[ Upstream commit 57d4f0b863 ]

Currently, scrub_missing_raid56_worker() puts and potentially frees
sblock (which embeds the work item) and then submits a bio through
scrub_wr_submit(). This is another potential instance of the bug in
"btrfs: don't prematurely free work in run_ordered_work()". Fix it by
dropping the reference after we submit the bio.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Omar Sandoval 2019-09-16 11:30:56 -07:00 committed by Greg Kroah-Hartman
parent 4a27508240
commit 7cfef55ff0
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/scrub.c
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@ -2421,14 +2421,13 @@ static void scrub_missing_raid56_worker(struct btrfs_work *work)
scrub_write_block_to_dev_replace(sblock);
}
scrub_block_put(sblock);
if (sctx->is_dev_replace && sctx->flush_all_writes) {
mutex_lock(&sctx->wr_lock);
scrub_wr_submit(sctx);
mutex_unlock(&sctx->wr_lock);
}
scrub_block_put(sblock);
scrub_pending_bio_dec(sctx);
}