Patch-mainline: v5.12-rc1
Git-commit: 36bf1dfb8b266e089afa9b7b984217f17027bf35
References: XSA-361 CVE-2021-26932 bsc#1181747
From: Stefano Stabellini <stefano.stabellini@xilinx.com>
Date: Mon, 15 Feb 2021 08:53:44 +0100
Subject: [PATCH 5/9] xen/arm: don't ignore return errors from
set_phys_to_machine
set_phys_to_machine can fail due to lack of memory, see the kzalloc call
in arch/arm/xen/p2m.c:__set_phys_to_machine_multi.
Don't ignore the potential return error in set_foreign_p2m_mapping,
returning it to the caller instead.
This is part of XSA-361.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Cc: stable@vger.kernel.org
Reviewed-by: Julien Grall <jgrall@amazon.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/arm/xen/p2m.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm/xen/p2m.c b/arch/arm/xen/p2m.c
index 0641ba54ab62..ce538c51fa3f 100644
--- a/arch/arm/xen/p2m.c
+++ b/arch/arm/xen/p2m.c
@@ -93,8 +93,10 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
for (i = 0; i < count; i++) {
if (map_ops[i].status)
continue;
- set_phys_to_machine(map_ops[i].host_addr >> XEN_PAGE_SHIFT,
- map_ops[i].dev_bus_addr >> XEN_PAGE_SHIFT);
+ if (unlikely(!set_phys_to_machine(map_ops[i].host_addr >> XEN_PAGE_SHIFT,
+ map_ops[i].dev_bus_addr >> XEN_PAGE_SHIFT))) {
+ return -ENOMEM;
+ }
}
return 0;
--
2.26.2