From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Wed, 13 Jan 2021 01:09:12 +0000 (+0100)
Subject: image-fit: fit_check_format check for valid FDT
X-Git-Url: http://git.dujemihanovic.xyz/html/index.html?a=commitdiff_plain;h=ea1a9ec5f430359720d9a0621ed1acfbba6a142a;p=u-boot.git

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>
---

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");