diff options
| author | Jan Beulich <jbeulich@suse.com> | 2021-03-26 16:28:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-30 14:41:43 +0200 |
| commit | 3cb86952ce3c8b28a0c1f3ce82848618d8628015 (patch) | |
| tree | 33bdb59890224e536597b222a236dc9ff4749555 | |
| parent | fffbb8528930f34c5a9b9e3562de0167a5377d52 (diff) | |
xen-blkback: don't leak persistent grants from xen_blkbk_map()
commit a846738f8c3788d846ed1f587270d2f2e3d32432 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/block/xen-blkback/blkback.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 2b739ba841b1..1a1ad0fdc039 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -937,7 +937,7 @@ 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; } |