From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Mon, 22 Apr 2019 22:51:01 +0000 (+0200)
Subject: efi_loader: check length in CreateDeviceNode()
X-Git-Tag: v2019.07-rc1~8^2
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=7d1e4b73e3f321cd4f0e039aa0387484cf97b25c;p=oweals%2Fu-boot.git

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>
---

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;