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[BitcodeReader] Validate OpNum, before accessing Record array.

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Currently invalid bitcode files can cause a crash, when OpNum exceeds
the number of elements in Record, like in the attached bitcode file.

The test case was generated by clusterfuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15698

Reviewers: t.p.northover, thegameg, jfb

Reviewed By: jfb

Differential Revision: https://reviews.llvm.org/D64507

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365750 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Florian Hahn
2019-07-11 09:57:00 +00:00
parent 3423b03f7b
commit 4af77dd891
3 changed files with 9 additions and 0 deletions
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test/Bitcode/invalid.test
+5
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@@ -235,3 +235,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-nonpointer-atomicrmw.bc 2>&1
RUN: FileCheck --check-prefix=NONPOINTER-ATOMICRMW %s
NONPOINTER-ATOMICRMW: Invalid record
RUN: not llvm-dis -disable-output %p/Inputs/invalid-fcmp-opnum.bc 2>&1 | \
RUN: FileCheck --check-prefix=INVALID-FCMP-OPNUM %s
INVALID-FCMP-OPNUM: Invalid record: operand number exceeded available operands