tree 1b5dcb40ee78d4a9a30ab636e207d817e7b17bbe
parent b707fabecefaf47813d6a980a55c64558bc9cd82
author Jan Beulich <jbeulich@suse.com> 1616772537 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1617107823 +0200

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>