u-boot: fix CVE-2024-57259

sqfs_search_dir in Das U-Boot before 2025.01-rc1 exhibits an off-by-one error
and resultant heap memory corruption for squashfs directory listing because the
path separator is not considered in a size calculation.

https://nvd.nist.gov/vuln/detail/CVE-2024-57259

(From OE-Core rev: e4b713ff07695487cc9307ffc3576a11775cde4d)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-bsp/u-boot/files/CVE-2024-57259.patch

@@ -0,0 +1,41 @@
+From 2c08fe306c6cbc60ec4beb434c71e56bb7abb678 Mon Sep 17 00:00:00 2001
+From: Richard Weinberger <richard@nod.at>
+Date: Fri, 2 Aug 2024 22:05:09 +0200
+Subject: [PATCH 8/8] squashfs: Fix heap corruption in sqfs_search_dir()
+
+res needs to be large enough to store both strings rem and target,
+plus the path separator and the terminator.
+Currently the space for the path separator is not accounted, so
+the heap is corrupted by one byte.
+
+Signed-off-by: Richard Weinberger <richard@nod.at>
+Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
+
+CVE: CVE-2024-57259
+Upstream-Status: Backport [https://source.denx.de/u-boot/u-boot/-/commit/048d795bb5b3d9c5701b4855f5e74bcf6849bf5e]
+Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
+---
+ fs/squashfs/sqfs.c | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
+index a5b7890e..1bd9b2a4 100644
+--- a/fs/squashfs/sqfs.c
++++ b/fs/squashfs/sqfs.c
+@@ -563,8 +563,11 @@ static int sqfs_search_dir(struct squashfs_dir_stream *dirs, char **token_list,
+ 				ret = -ENOMEM;
+ 				goto out;
+ 			}
+-			/* Concatenate remaining tokens and symlink's target */
+-			res = malloc(strlen(rem) + strlen(target) + 1);
++			/*
++			 * Concatenate remaining tokens and symlink's target.
++			 * Allocate enough space for rem, target, '/' and '\0'.
++			 */
++			res = malloc(strlen(rem) + strlen(target) + 2);
+ 			if (!res) {
+ 				ret = -ENOMEM;
+ 				goto out;
+-- 
+2.34.1
+

meta/recipes-bsp/u-boot/u-boot_2022.01.bb

@@ -18,6 +18,7 @@ SRC_URI +=       " file://0001-riscv32-Use-double-float-ABI-for-rv32.patch \
                    file://CVE-2024-57258-1.patch \
                    file://CVE-2024-57258-2.patch \
                    file://CVE-2024-57258-3.patch \
+                   file://CVE-2024-57259.patch \
                  "
 
 DEPENDS += "bc-native dtc-native python3-setuptools-native"