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[BitstreamReader] Make sure the Array operand type is an encoding

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Bug found with AFL fuzz.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238269 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Filipe Cabecinhas 2015-05-27 00:48:43 +00:00
parent ba7ccd4201
commit 316f9e05ce
3 changed files with 8 additions and 0 deletions
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3
lib/Bitcode/Reader/BitstreamReader.cpp
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@ -203,6 +203,9 @@ unsigned BitstreamCursor::readRecord(unsigned AbbrevID,
if (i + 2 != e)
report_fatal_error("Array op not second to last");
const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
if (!EltEnc.isEncoding())
report_fatal_error(
"Array element type has to be an encoding of a type");
if (EltEnc.getEncoding() == BitCodeAbbrevOp::Array ||
EltEnc.getEncoding() == BitCodeAbbrevOp::Blob)
report_fatal_error("Array element type can't be an Array or a Blob");

BIN
test/Bitcode/Inputs/invalid-array-operand-encoding.bc Normal file
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5
test/Bitcode/invalid.test
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@ -177,3 +177,8 @@ 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
RUN: not llvm-dis -disable-output %p/Inputs/invalid-array-operand-encoding.bc 2>&1 | \
RUN: FileCheck --check-prefix=ARRAY-OP-ENC %s
ARRAY-OP-ENC: Array element type has to be an encoding of a type