Ted Kremenek 90d7fa12d0 Fix buffer underrun (invalid read) triggered during diagnostic rendering. The test would overflow when computing '0 - 1'. ...

I don't have a good testcase for this that does not depend on system headers.
It did not trigger with preprocessed output, and I had trouble reducing the example.

Fixes <rdar://problem/13324594>.

Thanks to Michael Greiner for reporting this issue.

llvm-svn: 177201

2013-03-15 23:09:37 +00:00

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