Akinobu Mita
2013-Nov-18 13:13 UTC
[PATCH] btrfs: fix bio_size_ok() for max_sectors > 0xffff
The data type of max_sectors in queue settings is unsigned int. But
this value is stored to the local variable whose type is unsigned short
in bio_size_ok(). This can cause unexpected result when max_sectors >
0xffff.
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: linux-btrfs@vger.kernel.org
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
This patch is only compile tested.
fs/btrfs/volumes.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 0db6370..92303f4 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5394,7 +5394,7 @@ static int bio_size_ok(struct block_device *bdev, struct
bio *bio,
{
struct bio_vec *prev;
struct request_queue *q = bdev_get_queue(bdev);
- unsigned short max_sectors = queue_max_sectors(q);
+ unsigned int max_sectors = queue_max_sectors(q);
struct bvec_merge_data bvm = {
.bi_bdev = bdev,
.bi_sector = sector,
--
1.8.3.2
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