bcache: Fix a null ptr deref regression
authorKent Overstreet <kmo@daterainc.com>
Fri, 11 Oct 2013 00:31:15 +0000 (17:31 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 11 Oct 2013 01:17:39 +0000 (18:17 -0700)
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@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>
drivers/md/bcache/request.c

index 71eb233b9ace7a23f143170e8f4cc924a2a1de9a..b6a74bcbb08f8800bae2aa57888498a46eb85f69 100644 (file)
@@ -996,6 +996,7 @@ static void request_write(struct cached_dev *dc, struct search *s)
                closure_bio_submit(bio, cl, s->d);
        } else {
                bch_writeback_add(dc);
+               s->op.cache_bio = bio;
 
                if (bio->bi_rw & REQ_FLUSH) {
                        /* 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;
 
                        closure_bio_submit(flush, cl, s->d);
-               } else {
-                       s->op.cache_bio = bio;
                }
        }
 out: