Jonas Devlieghere 7689b8dd09 [WASM] Fix overflow when reading custom section ...

When reading a custom WASM section, it was possible that its name
extended beyond the size of the section. This resulted in a bogus value
for the section size due to the size overflowing.

Fixes heap buffer overflow detected by OSS-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8190

Differential revision: https://reviews.llvm.org/D50387

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339269 91177308-0d34-0410-b5e6-96231b3b80d8

2018-08-08 16:34:03 +00:00

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