[llvm] r234887 - Error out of ParseBitcodeInto(Module*) if we haven't read a Module
Filipe Cabecinhas
me at filcab.net
Tue Apr 14 07:07:15 PDT 2015
Author: filcab
Date: Tue Apr 14 09:07:15 2015
New Revision: 234887
URL: http://llvm.org/viewvc/llvm-project?rev=234887&view=rev
Log:
Error out of ParseBitcodeInto(Module*) if we haven't read a Module
Summary:
Without this check the following case failed:
Skip a SubBlock which is not a MODULE_BLOCK_ID nor a BLOCKINFO_BLOCK_ID
Got to end of file
TheModule would still be == nullptr, and we would subsequentially fail
when materializing the Module (assert at the start of
BitcodeReader::MaterializeModule).
Bug found with AFL.
Reviewers: dexonsmith, rafael
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D9014
Added:
llvm/trunk/test/Bitcode/Inputs/invalid-no-proper-module.bc
Modified:
llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp
llvm/trunk/test/Bitcode/invalid.test
Modified: llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp?rev=234887&r1=234886&r2=234887&view=diff
==============================================================================
--- llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp (original)
+++ llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp Tue Apr 14 09:07:15 2015
@@ -3063,8 +3063,12 @@ std::error_code BitcodeReader::ParseBitc
// We expect a number of well-defined blocks, though we don't necessarily
// need to understand them all.
while (1) {
- if (Stream.AtEndOfStream())
- return std::error_code();
+ if (Stream.AtEndOfStream()) {
+ if (TheModule)
+ return std::error_code();
+ // We didn't really read a proper Module.
+ return Error("Malformed IR file");
+ }
BitstreamEntry Entry =
Stream.advance(BitstreamCursor::AF_DontAutoprocessAbbrevs);
Added: llvm/trunk/test/Bitcode/Inputs/invalid-no-proper-module.bc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Bitcode/Inputs/invalid-no-proper-module.bc?rev=234887&view=auto
==============================================================================
Binary files llvm/trunk/test/Bitcode/Inputs/invalid-no-proper-module.bc (added) and llvm/trunk/test/Bitcode/Inputs/invalid-no-proper-module.bc Tue Apr 14 09:07:15 2015 differ
Modified: llvm/trunk/test/Bitcode/invalid.test
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Bitcode/invalid.test?rev=234887&r1=234886&r2=234887&view=diff
==============================================================================
--- llvm/trunk/test/Bitcode/invalid.test (original)
+++ llvm/trunk/test/Bitcode/invalid.test Tue Apr 14 09:07:15 2015
@@ -50,3 +50,8 @@ EXTRACT-IDXS: EXTRACTVAL: Invalid type
INSERT-ARRAY: INSERTVAL: Invalid array index
INSERT-STRUCT: INSERTVAL: Invalid struct index
INSERT-IDXS: INSERTVAL: Invalid type
+
+RUN: not llvm-dis -disable-output %p/Inputs/invalid-no-proper-module.bc 2>&1 | \
+RUN: FileCheck --check-prefix=NO-MODULE %s
+
+NO-MODULE: Malformed IR file
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