PrologEpilogInserter::replaceFrameIndices reads past last instruction in basic block #4218
Description
| Bugzilla Link | 3846 |
| Resolution | FIXED |
| Resolved on | Mar 20, 2009 10:13 |
| Version | 2.5 |
| OS | All |
| Reporter | LLVM Bugzilla Contributor |
| CC | @ggreif |
Extended Description
This bug is similar to bug 3842.
In certain cases, the replaceFrameIndices walks off the end of the instruction iterator at line 573 of http://llvm.org/viewvc/llvm-project/llvm/tags/RELEASE_25/lib/CodeGen/PrologEpilogInserter.cpp?annotate=65926, due to an unchecked ++I.
The solution is to check that I is not the end of the block before incrementing. I.e. replace line 573 with:
if (DoIncr && BB->end != I) ++I;