xen/blkback: fix reference counting

If the permission check fails, we drop a reference to the blkif without
having taken it in the first place. The bug was introduced in commit
604c499cbbcc3d5fe5fb8d53306aa0fae1990109 (xen/blkback: Check device
permissions before allowing OP_DISCARD).

Cc: stable@vger.kernel.org
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index bf4b9d282c042ec4d5b3c31a9d3192bd059afcc5..6620b73d04906191132d771dade31f9e00043e07 100644 (file)
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -887,6 +887,8 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
        unsigned long secure;
        struct phys_req preq;
 
+       xen_blkif_get(blkif);
+
        preq.sector_number = req->u.discard.sector_number;
        preq.nr_sects      = req->u.discard.nr_sectors;
 
@@ -899,7 +901,6 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
        }
        blkif->st_ds_req++;
 
-       xen_blkif_get(blkif);
        secure = (blkif->vbd.discard_secure &&
                 (req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
                 BLKDEV_DISCARD_SECURE : 0;