linux-kernel - [ 110/110] bcache: Fix a null ptr deref regression

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Date:	Fri, 11 Oct 2013 12:39:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Kent Overstreet <kmo@...erainc.com>,
	Gabriel de Perthuis <g2p.code@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 110/110] bcache: Fix a null ptr deref regression

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kent Overstreet <kmo@...erainc.com>

commit 2fe80d3bbf1c8bd9efc5b8154207c8dd104e7306 upstream.

Commit c0f04d88e46d ("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@...erainc.com>
Reported-by: Gabriel de Perthuis <g2p.code@...il.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bcache/request.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1055,6 +1055,7 @@ static void request_write(struct cached_
 	} else {
 		trace_bcache_writeback(s->orig_bio);
 		bch_writeback_add(dc, bio_sectors(bio));
+		s->op.cache_bio = bio;
 
 		if (bio->bi_rw & REQ_FLUSH) {
 			/* Also need to send a flush to the backing device */
@@ -1067,8 +1068,6 @@ static void request_write(struct cached_
 			flush->bi_private = cl;
 
 			closure_bio_submit(flush, cl, s->d);
-		} else {
-			s->op.cache_bio = bio;
 		}
 	}
 out:


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