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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 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Sadaf Ebrahimi <sadafebrahimi@google.com>
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Date: Thu, 2 Jun 2022 19:32:22 +0000
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Subject: [PATCH] Prevent XML_GetBuffer signed integer overflow
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Bug: http://b/221255869
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Change-Id: I38758fae8c71184f728f95e6073457cdb86bcc29
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(cherry picked from commit d6a09f1b7fb24dd03dc58e45062ad951a37ff8e3)
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Merged-In: I38758fae8c71184f728f95e6073457cdb86bcc29
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---
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lib/xmlparse.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/lib/xmlparse.c b/lib/xmlparse.c
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index 67f661b5..1d6e722d 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -2040,6 +2040,11 @@ XML_GetBuffer(XML_Parser parser, int len)
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keep = (int)(parser->m_bufferPtr - parser->m_buffer);
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if (keep > XML_CONTEXT_BYTES)
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keep = XML_CONTEXT_BYTES;
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+ /* Detect and prevent integer overflow */
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+ if (keep > INT_MAX - neededSize) {
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+ parser->m_errorCode = XML_ERROR_NO_MEMORY;
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+ return NULL;
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+ }
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neededSize += keep;
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#endif /* defined XML_CONTEXT_BYTES */
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if (neededSize <= parser->m_bufferLim - parser->m_buffer) {
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