[PATCH 4.9 79/94] xfs: fix integer truncation in xfs_bmap_remap_alloc

From: Greg Kroah-Hartman
Date: Mon Jun 05 2017 - 12:26:43 EST


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

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

From: Christoph Hellwig <hch@xxxxxx>

commit 52813fb13ff90bd9c39a93446cbf1103c290b6e9 upstream.

bno should be a xfs_fsblock_t, which is 64-bit wides instead of a
xfs_aglock_t, which truncates the value to 32 bits.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/xfs/libxfs/xfs_bmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -3964,7 +3964,7 @@ xfs_bmap_remap_alloc(
{
struct xfs_trans *tp = ap->tp;
struct xfs_mount *mp = tp->t_mountp;
- xfs_agblock_t bno;
+ xfs_fsblock_t bno;
struct xfs_alloc_arg args;
int error;