[PATCH 3.12 095/142] md/raid10: fix memory leak when reshaping a RAID10.

[Jiri Slaby]

From: NeilBrown <neilb@xxxxxxx>

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

===============

commit ce0b0a46955d1bb389684a2605dbcaa990ba0154 upstream.

raid10 reshape clears unwanted bits from a bio->bi_flags using
a method which, while clumsy, worked until 3.10 when BIO_OWNS_VEC
was added.
Since then it clears that bit but shouldn't.  This results in a
memory leak.

So change to used the approved method of clearing unwanted bits.

As this causes a memory leak which can consume all of memory
the fix is suitable for -stable.

Fixes: a38352e0ac02dbbd4fa464dc22d1352b5fbd06fd
Reported-by: mdraid.pkoch@xxxxxxxx (Peter Koch)
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/md/raid10.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 867a8b67d5b9..d1cf7734e55e 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4419,7 +4419,7 @@ read_more:
 	read_bio->bi_private = r10_bio;
 	read_bio->bi_end_io = end_sync_read;
 	read_bio->bi_rw = READ;
-	read_bio->bi_flags &= ~(BIO_POOL_MASK - 1);
+	read_bio->bi_flags &= (~0UL << BIO_RESET_BITS);
 	read_bio->bi_flags |= 1 << BIO_UPTODATE;
 	read_bio->bi_vcnt = 0;
 	read_bio->bi_size = 0;
-- 
2.1.0

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