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authorJan Beulich <jbeulich@suse.com>2021-03-26 16:33:53 +0100
committerJuergen Gross <jgross@suse.com>2021-03-26 16:33:53 +0100
commita846738f8c3788d846ed1f587270d2f2e3d32432 (patch)
treed3804e301582c22883cab22c25164ccbd00ffc9a /drivers/block/xen-blkback
parentaf44a387e743ab7aa39d3fb5e29c0a973cf91bdc (diff)
xen-blkback: don't leak persistent grants from xen_blkbk_map()
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@suse.com> Cc: stable@vger.kernel.org Reviewed-by: Juergen Gross <jgross@suse.com> Reviewed-by: Wei Liu <wl@xen.org> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/block/xen-blkback')
-rw-r--r--drivers/block/xen-blkback/blkback.c2
1 files changed, 1 insertions, 1 deletions
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 @@ next:
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;
}