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bcache: Fix a null ptr deref regression

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Commit c0f04d88e4 ("bcache: Fix flushes in writeback mode") was fixing
a reported data corruption bug, but it seems some last minute
refactoring or rebasing introduced a null pointer deref.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
Reported-by: Gabriel de Perthuis <g2p.code@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kent Overstreet 2013-10-10 17:31:15 -07:00 • committed by Linus Torvalds
parent e3e8ded06f
commit 2fe80d3bbf
1 changed files with 1 additions and 2 deletions
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3
drivers/md/bcache/request.c
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@ -996,6 +996,7 @@ static void request_write(struct cached_dev *dc, struct search *s)
closure_bio_submit(bio, cl, s->d); closure_bio_submit(bio, cl, s->d);
} else { } else {
bch_writeback_add(dc); bch_writeback_add(dc);
s->op.cache_bio = bio;
if (bio->bi_rw & REQ_FLUSH) { if (bio->bi_rw & REQ_FLUSH) {
/* Also need to send a flush to the backing device */ /* Also need to send a flush to the backing device */
@ -1008,8 +1009,6 @@ static void request_write(struct cached_dev *dc, struct search *s)
flush->bi_private = cl; flush->bi_private = cl;
closure_bio_submit(flush, cl, s->d); closure_bio_submit(flush, cl, s->d);
} else {
s->op.cache_bio = bio;
} }
} }
out: out: