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Fix undefined behavior (signed integer overflow) when Clang parses a hexfloat with an enormous exponent. Caught by an existing unit test + -ftrapv.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162505 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Smith
2012-08-24 00:01:19 +00:00
parent 5d04a3ad0e
commit b080e2fb1c
1 changed files with 3 additions and 1 deletions
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4
lib/Support/APFloat.cpp
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@@ -196,8 +196,10 @@ totalExponent(StringRef::iterator p, StringRef::iterator end,
assert(value < 10U && "Invalid character in exponent"); assert(value < 10U && "Invalid character in exponent");
unsignedExponent = unsignedExponent * 10 + value; unsignedExponent = unsignedExponent * 10 + value;
if (unsignedExponent > 32767) if (unsignedExponent > 32767) {
overflow = true; overflow = true;
break;
}
} }
if (exponentAdjustment > 32767 || exponentAdjustment < -32768) if (exponentAdjustment > 32767 || exponentAdjustment < -32768)