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Don't assert if materializing before seeing any function bodies 

This assert was reachable from user input. A minimized test case (no
FUNCTION_BLOCK_ID record) is attached.

Bug found with afl-fuzz

llvm-svn: 251910
This commit is contained in:
Filipe Cabecinhas 2015-11-03 13:48:26 +00:00
parent f3e167af4b
commit 7aae2f23c8
3 changed files with 8 additions and 1 deletions
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4
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@ -3055,7 +3055,9 @@ std::error_code BitcodeReader::rememberAndSkipFunctionBodies() {
if (Stream.AtEndOfStream())
return error("Could not find function in stream");
assert(SeenFirstFunctionBody);
if (!SeenFirstFunctionBody)
return error("Trying to materialize functions before seeing function blocks");
// An old bitcode file with the symbol table at the end would have
// finished the parse greedily.
assert(SeenValueSymbolTable);

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llvm/test/Bitcode/Inputs/invalid-no-function-block.bc Normal file
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5
llvm/test/Bitcode/invalid.test
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@ -207,3 +207,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-alias-type-mismatch.bc 2>&1
RUN: FileCheck --check-prefix=ALIAS-TYPE-MISMATCH %s
ALIAS-TYPE-MISMATCH: Alias and aliasee types don't match
RUN: not llvm-dis -disable-output %p/Inputs/invalid-no-function-block.bc 2>&1 | \
RUN: FileCheck --check-prefix=NO-FUNCTION-BLOCK %s
NO-FUNCTION-BLOCK: Trying to materialize functions before seeing function blocks