mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-07-03 10:02:28 +00:00
50 lines
1.7 KiB
Diff
50 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Mike McTernan <mikemcternan@google.com>
|
|
Date: Fri, 22 Jul 2022 11:44:33 +0100
|
|
Subject: [PATCH] Fix integer wrap sanitisation.
|
|
|
|
Test: make check
|
|
Bug: 239630493
|
|
Bug: 242096164
|
|
Change-Id: I232155e7f7a54271a6a3e3a7cd91ed6bbabc051f
|
|
Merged-In: I232155e7f7a54271a6a3e3a7cd91ed6bbabc051f
|
|
(cherry picked from commit 05dec6d1827dc7016cad11c4ddfe8f965bceddb7)
|
|
(cherry picked from commit 61e10c9c53b170ff8a5612ba4ec79e51d58e5eb3)
|
|
Merged-In: I232155e7f7a54271a6a3e3a7cd91ed6bbabc051f
|
|
---
|
|
libfdt/fdt.c | 14 ++++++++++----
|
|
1 file changed, 10 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/libfdt/fdt.c b/libfdt/fdt.c
|
|
index 5baaed3..ed7e947 100644
|
|
--- a/libfdt/fdt.c
|
|
+++ b/libfdt/fdt.c
|
|
@@ -124,9 +124,15 @@ uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
|
|
lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
|
|
if (!lenp)
|
|
return FDT_END; /* premature end */
|
|
- /* skip-name offset, length and value */
|
|
- offset += sizeof(struct fdt_property) - FDT_TAGSIZE
|
|
- + fdt32_to_cpu(*lenp);
|
|
+
|
|
+ /* skip-name offset, length */
|
|
+ offset += sizeof(struct fdt_property) - FDT_TAGSIZE;
|
|
+
|
|
+ if (!fdt_offset_ptr(fdt, offset, fdt32_to_cpu(*lenp)))
|
|
+ return FDT_END; /* premature end */
|
|
+
|
|
+ /* skip value */
|
|
+ offset += fdt32_to_cpu(*lenp);
|
|
break;
|
|
|
|
case FDT_END:
|
|
@@ -138,7 +144,7 @@ uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
|
|
return FDT_END;
|
|
}
|
|
|
|
- if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
|
|
+ if (offset <= startoffset || !fdt_offset_ptr(fdt, startoffset, offset - startoffset))
|
|
return FDT_END; /* premature end */
|
|
|
|
*nextoffset = FDT_TAGALIGN(offset);
|