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https://github.com/Divested-Mobile/DivestOS-Build.git
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30 lines
1.1 KiB
Diff
30 lines
1.1 KiB
Diff
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From 2f6bf894b7c3462f0af6cebfb7b7400f820e4220 Mon Sep 17 00:00:00 2001
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From: Steven Moreland <smoreland@google.com>
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Date: Fri, 17 May 2019 13:11:30 -0700
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Subject: [PATCH] readCString: no ubsan sub-overflow
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Bug: 132650049
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Test: fuzzer
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Change-Id: I1f6dcad6906951ab505a7500573b74b210a68705
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Merged-In: I1f6dcad6906951ab505a7500573b74b210a68705
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(cherry picked from commit 1086548c6ceb141e2852d2690db8386911a014dd)
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---
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libs/binder/Parcel.cpp | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
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index e369c444ba..2ca4170c7d 100644
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--- a/libs/binder/Parcel.cpp
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+++ b/libs/binder/Parcel.cpp
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@@ -1136,8 +1136,8 @@ intptr_t Parcel::readIntPtr() const
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const char* Parcel::readCString() const
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{
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- const size_t avail = mDataSize-mDataPos;
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- if (avail > 0) {
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+ if (mDataPos < mDataSize) {
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+ const size_t avail = mDataSize-mDataPos;
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const char* str = reinterpret_cast<const char*>(mData+mDataPos);
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// is the string's trailing NUL within the parcel's valid bounds?
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const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
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