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55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Sadaf Ebrahimi <sadafebrahimi@google.com>
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Date: Fri, 3 Jun 2022 03:40:21 +0000
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Subject: [PATCH] Prevent integer overflow in function doProlog
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Bug: http://b/221256678
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Change-Id: I6fe381103f4eb287726d1ccb5bfec99db160ffe4
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(cherry picked from commit 257f1d3777240016d3ccd74a61cd7d0e0efcaae3)
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Merged-In: I6fe381103f4eb287726d1ccb5bfec99db160ffe4
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---
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lib/xmlparse.c | 20 +++++++++++++-------
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1 file changed, 13 insertions(+), 7 deletions(-)
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diff --git a/lib/xmlparse.c b/lib/xmlparse.c
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index 91f50034..0e57538a 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -4671,23 +4671,29 @@ doProlog(XML_Parser parser,
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if (dtd->in_eldecl) {
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ELEMENT_TYPE *el;
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const XML_Char *name;
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- int nameLen;
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- const char *nxt = (quant == XML_CQUANT_NONE
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- ? next
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- : next - enc->minBytesPerChar);
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+ size_t nameLen;
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+ const char *nxt
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+ = (quant == XML_CQUANT_NONE ? next : next - enc->minBytesPerChar);
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int myindex = nextScaffoldPart(parser);
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if (myindex < 0)
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return XML_ERROR_NO_MEMORY;
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dtd->scaffold[myindex].type = XML_CTYPE_NAME;
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dtd->scaffold[myindex].quant = quant;
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el = getElementType(parser, enc, s, nxt);
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- if (!el)
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+ if (! el)
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return XML_ERROR_NO_MEMORY;
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name = el->name;
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dtd->scaffold[myindex].name = name;
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nameLen = 0;
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- for (; name[nameLen++]; );
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- dtd->contentStringLen += nameLen;
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+ for (; name[nameLen++];)
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+ ;
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+
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+ /* Detect and prevent integer overflow */
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+ if (nameLen > UINT_MAX - dtd->contentStringLen) {
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+ return XML_ERROR_NO_MEMORY;
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+ }
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+
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+ dtd->contentStringLen += (unsigned)nameLen;
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if (elementDeclHandler)
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handleDefault = XML_FALSE;
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}
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