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From ea1a9ec5f430359720d9a0621ed1acfbba6a142a Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Wed, 13 Jan 2021 02:09:12 +0100
Subject: [PATCH] image-fit: fit_check_format check for valid FDT
fit_check_format() must check that the buffer contains a flattened device
tree before calling any device tree library functions.
Failure to do may cause segmentation faults.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Upstream-Status: Backport[https://github.com/u-boot/u-boot/commit/ea1a9ec5f430359720d9a0621ed1acfbba6a142a]
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
---
common/image-fit.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/common/image-fit.c b/common/image-fit.c
index 6a8787ca0a..21c44bdf69 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1553,6 +1553,12 @@ int fit_image_check_comp(const void *fit, int noffset, uint8_t comp)
*/
int fit_check_format(const void *fit)
{
+ /* A FIT image must be a valid FDT */
+ if (fdt_check_header(fit)) {
+ debug("Wrong FIT format: not a flattened device tree\n");
+ return 0;
+ }
+
/* mandatory / node 'description' property */
if (fdt_getprop(fit, 0, FIT_DESC_PROP, NULL) == NULL) {
debug("Wrong FIT format: no description\n");
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