[BitcodeReader] Validate OpNum, before accessing Record array.
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
projects / llvm / commit