From 7d1e4b73e3f321cd4f0e039aa0387484cf97b25c Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Tue, 23 Apr 2019 00:51:01 +0200
Subject: [PATCH] efi_loader: check length in CreateDeviceNode()
When creating a device path node ensure that the size of the allocated
memory at lest matches the size of the node header.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
lib/efi_loader/efi_device_path.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 6104c7d33b..10f890f44f 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -335,6 +335,9 @@ struct efi_device_path *efi_dp_create_device_node(const u8 type,
{
struct efi_device_path *ret;
+ if (length < sizeof(struct efi_device_path))
+ return NULL;
+
ret = dp_alloc(length);
if (!ret)
return ret;
--
2.39.5