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-rw-r--r--core/fpdfapi/parser/cpdf_hint_tables.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/core/fpdfapi/parser/cpdf_hint_tables.cpp b/core/fpdfapi/parser/cpdf_hint_tables.cpp
index 24abf5dd13..6a84143f9e 100644
--- a/core/fpdfapi/parser/cpdf_hint_tables.cpp
+++ b/core/fpdfapi/parser/cpdf_hint_tables.cpp
@@ -290,6 +290,11 @@ bool CPDF_HintTables::ReadSharedObjHintTable(CFX_BitStream* hStream,
// greatest and least length of a shared object group, in bytes.
uint32_t dwDeltaGroupLen = hStream->GetBits(16);
+ // Trying to decode more than 32 bits isn't going to work when we write into
+ // a uint32_t.
+ if (dwDeltaGroupLen > 31)
+ return false;
+
if (dwFirstSharedObjNum >= CPDF_Parser::kMaxObjectNumber ||
m_nFirstPageSharedObjs >= CPDF_Parser::kMaxObjectNumber ||
dwSharedObjTotal >= CPDF_Parser::kMaxObjectNumber) {