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authorHauke Mehrtens2026-06-12 23:17:23 +0000
committerHauke Mehrtens2026-06-18 00:24:16 +0000
commit4c468d22fbe5e1065c718f50e8413423e6702684 (patch)
tree73d571e7a8cf0c92da52d7b1af80a9bcd21ee0e8
parentfda611d2751ea7e10bd16de8e55d498beca35f09 (diff)
downloadopenwrt-4c468d22fbe5e1065c718f50e8413423e6702684.tar.gz
fritz-tools: fix out-of-bounds memset in TFFS segment expansion
When growing the segment array in find_entry(), the memset() that zeroes the newly allocated slots computed the destination with redundant sizeof scaling: memset(segments + (num_segments * sizeof(struct tffs_entry_segment)), ...) segments is a typed pointer, so pointer arithmetic already scales by the element size. Multiplying the offset by sizeof again advances the destination by num_segments * sizeof^2 bytes, landing far outside the realloc()'d buffer and zeroing unrelated heap memory whenever a TFFS entry spans multiple segments that require array expansion. Drop the redundant multiplication so the memset targets segments[num_segments]. This is a robustness fix for malformed/corrupt TFFS content; the parser only reads the on-device nand-tffs MTD partition as root, so it is not considered security relevant. Reported-by: @Vasco0x4 Assisted-by: Claude:claude-opus-4-8 Link: https://github.com/openwrt/openwrt/pull/23763 (cherry picked from commit 7e7bd602ea8967858267c2a6929f4dbaffe90839) Link: https://github.com/openwrt/openwrt/pull/23822 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
-rw-r--r--package/utils/fritz-tools/Makefile2
-rw-r--r--package/utils/fritz-tools/src/fritz_tffs_nand_read.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/package/utils/fritz-tools/Makefile b/package/utils/fritz-tools/Makefile
index b43fe20e9e..4cb196bbfe 100644
--- a/package/utils/fritz-tools/Makefile
+++ b/package/utils/fritz-tools/Makefile
@@ -1,7 +1,7 @@
include $(TOPDIR)/rules.mk
PKG_NAME:=fritz-tools
-PKG_RELEASE:=3
+PKG_RELEASE:=4
CMAKE_INSTALL:=1
include $(INCLUDE_DIR)/package.mk
diff --git a/package/utils/fritz-tools/src/fritz_tffs_nand_read.c b/package/utils/fritz-tools/src/fritz_tffs_nand_read.c
index 05179bb423..65d405063e 100644
--- a/package/utils/fritz-tools/src/fritz_tffs_nand_read.c
+++ b/package/utils/fritz-tools/src/fritz_tffs_nand_read.c
@@ -245,7 +245,7 @@ static int find_entry(uint32_t id, struct tffs_entry *entry)
uint32_t new_num_segs = next_seg == 0 ? seg + 1 : next_seg + 1;
if (new_num_segs > num_segments) {
segments = realloc(segments, new_num_segs * sizeof(struct tffs_entry_segment));
- memset(segments + (num_segments * sizeof(struct tffs_entry_segment)), 0x0,
+ memset(segments + num_segments, 0x0,
(new_num_segs - num_segments) * sizeof(struct tffs_entry_segment));
num_segments = new_num_segs;
}