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Fix reading beyond end of buffer in UTF-16 decoding code.

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Verify that incrementing the input pointer doesn't take us outside the buffer.
Still accept a single trailing NUL as the string terminator.
This commit is contained in:
Vadim Zeitlin
2015-06-19 20:31:48 +02:00
parent 04c4e5f177
commit f72aa7b1c9
1 changed files with 12 additions and 2 deletions
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14
src/common/strconv.cpp
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@@ -1702,8 +1702,18 @@ wxMBConvUTF16swap::ToWChar(wchar_t *dst, size_t dstLen,
wxUint16 tmp[2];
tmp[0] = wxUINT16_SWAP_ALWAYS(*inBuff);
inBuff++;
tmp[1] = wxUINT16_SWAP_ALWAYS(*inBuff);
if ( ++inBuff < inEnd )
{
// Normal case, we have a next character to decode.
tmp[1] = wxUINT16_SWAP_ALWAYS(*inBuff);
}
else // End of input.
{
// Setting the second character to 0 ensures we correctly return
// wxCONV_FAILED if the first one is the first half of a surrogate
// as the second half can't be 0 in this case.
tmp[1] = 0;
}
const size_t numChars = decode_utf16(tmp, ch);
if ( numChars == wxCONV_FAILED )