[PATCH 3.10 48/71] md/raid10: fix memory leak when reshaping a RAID10.

From: Greg Kroah-Hartman
Date: Mon Sep 15 2014 - 15:53:36 EST


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

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

From: NeilBrown <neilb@xxxxxxx>

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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/md/raid10.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4398,7 +4398,7 @@ 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;


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