kevin/linux
1
Fork 0
Code

xen-blkback: don't leak persistent grants from xen_blkbk_map()

Browse Source 
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>
This commit is contained in:
Jan Beulich 2021-03-26 16:33:53 +01:00 committed by Juergen Gross
parent af44a387e7
commit a846738f8c
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/block/xen-blkback/blkback.c
View File

@ -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;
}