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