[PATCH][H/G/F/X] xen-blkback: don't leak persistent grants from xen_blkbk_map()

[Tim Gardner]

From: Jan Beulich <jbeulich at suse.com>

CVE-2021-28688

The fix for XSA-365 zapped too many of the ->persistent_gnt[] entries.
Ones successfully obtained should not be overwritten, but instead left
for xen_blkbk_unmap_prepare() to pick up and put.

This is XSA-371.

Signed-off-by: Jan Beulich <jbeulich at suse.com>
Cc: stable at vger.kernel.org
Reviewed-by: Juergen Gross <jgross at suse.com>
Reviewed-by: Wei Liu <wl at xen.org>
Signed-off-by: Juergen Gross <jgross at suse.com>
(cherry picked from commit a846738f8c3788d846ed1f587270d2f2e3d32432)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 drivers/block/xen-blkback/blkback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index da16121140ca..3874233f7194 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -891,7 +891,7 @@ static int xen_blkbk_map(struct xen_blkif_ring *ring,
 out:
 	for (i = last_map; i < num; i++) {
 		/* Don't zap current batch's valid persistent grants. */
-		if(i >= last_map + segs_to_map)
+		if(i >= map_until)
 			pages[i]->persistent_gnt = NULL;
 		pages[i]->handle = BLKBACK_INVALID_HANDLE;
 	}
-- 
2.17.1