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r322390 | vsapsai | 2018-01-12 10:54:35 -0800 (Fri, 12 Jan 2018) | 20 lines

[Lex] Avoid out-of-bounds dereference in LexAngledStringLiteral.

Fix makes the loop in LexAngledStringLiteral more like the loops in
LexStringLiteral, LexCharConstant. When we skip a character after
backslash, we need to check if we reached the end of the file instead of
reading the next character unconditionally.

Discovered by OSS-Fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3832

rdar://problem/35572754

Reviewers: arphaman, kcc, rsmith, dexonsmith

Reviewed By: rsmith, dexonsmith

Subscribers: cfe-commits, rsmith, dexonsmith

Differential Revision: https://reviews.llvm.org/D41423

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_60@322649 91177308-0d34-0410-b5e6-96231b3b80d8