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[Support] Fix overflow in SLEB128 decoding.

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decodeULEB128 was fixed in r216268, but decodeSLEB128 always had the
same issue, which is now exposed in r301369.

llvm-svn: 301510
This commit is contained in:
Ahmed Bougacha 2017-04-27 02:09:44 +00:00
parent 60b774306e
commit c840b5c6e8
1 changed files with 1 additions and 1 deletions
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2
include/llvm/Support/LEB128.h
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@ -160,7 +160,7 @@ inline int64_t decodeSLEB128(const uint8_t *p, unsigned *n = nullptr,
return 0;
}
Byte = *p++;
Value |= ((Byte & 0x7f) << Shift);
Value |= (int64_t(Byte & 0x7f) << Shift);
Shift += 7;
} while (Byte >= 128);
// Sign extend negative numbers.