[BitcodeReader] Make sure abbrev records have at least one operand (record code)

Bug found with AFL fuzz.

llvm-svn: 238265

3 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitstreamReader.cpp b/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
index 3b03f4b12b8..2d02549ce4e 100644
--- a/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
@@ -282,6 +282,9 @@ void BitstreamCursor::ReadAbbrevRecord() {
     } else
       Abbv->Add(BitCodeAbbrevOp(E));
   }
+
+  if (Abbv->getNumOperandInfos() == 0)
+    report_fatal_error("Abbrev record with no operands");
   CurAbbrevs.push_back(Abbv);
 }
 
diff --git a/llvm/test/Bitcode/Inputs/invalid-abbrev-no-operands.bc b/llvm/test/Bitcode/Inputs/invalid-abbrev-no-operands.bc
new file mode 100644
index 00000000000..29af122e94e
--- /dev/null
+++ b/llvm/test/Bitcode/Inputs/invalid-abbrev-no-operands.bc
diff --git a/llvm/test/Bitcode/invalid.test b/llvm/test/Bitcode/invalid.test
index bd6e265cbb3..9c9d54fad6c 100644
--- a/llvm/test/Bitcode/invalid.test
+++ b/llvm/test/Bitcode/invalid.test
@@ -172,3 +172,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-global-var-comdat-id.bc 2>&1
 RUN:   FileCheck --check-prefix=INVALID-GVCOMDAT-ID %s
 
 INVALID-GVCOMDAT-ID: Invalid global variable comdat ID
+
+RUN: not llvm-dis -disable-output %p/Inputs/invalid-abbrev-no-operands.bc 2>&1 | \
+RUN:   FileCheck --check-prefix=ABBREV-NO-OPS %s
+
+ABBREV-NO-OPS: Abbrev record with no operands