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From 27354e9d9696ee2bc063910a6c9a6b27c5184a52 Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <aacid@kde.org>
Date: Thu, 25 Aug 2022 00:14:22 +0200
Subject: [PATCH] JBIG2Stream: Fix crash on broken file
https://github.com/jeffssh/CVE-2021-30860
Thanks to David Warren for the heads up
---
poppler/JBIG2Stream.cc | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/poppler/JBIG2Stream.cc b/poppler/JBIG2Stream.cc
index a861da2..0bd8305 100644
--- a/poppler/JBIG2Stream.cc
+++ b/poppler/JBIG2Stream.cc
@@ -2099,7 +2099,11 @@ void JBIG2Stream::readTextRegionSeg(unsigned int segNum, bool imm,
for (i = 0; i < nRefSegs; ++i) {
if ((seg = findSegment(refSegs[i]))) {
if (seg->getType() == jbig2SegSymbolDict) {
- numSyms += ((JBIG2SymbolDict *)seg)->getSize();
+ const unsigned int segSize = ((JBIG2SymbolDict *)seg)->getSize();
+ if (unlikely(checkedAdd(numSyms, segSize, &numSyms))) {
+ error(errSyntaxError, getPos(), "Too many symbols in JBIG2 text region");
+ return;
+ }
} else if (seg->getType() == jbig2SegCodeTable) {
codeTables->push_back(seg);
}
--
1.8.3.1
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