torcontrol: Check for reading errors in ReadBinaryFile
This ensures that ReadBinaryFile never returns exactly TOR_COOKIE_SIZE bytes if the file was larger than that.
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64101d0407
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@ -324,6 +324,10 @@ static std::pair<bool,std::string> ReadBinaryFile(const std::string &filename, s
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char buffer[128];
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size_t n;
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while ((n=fread(buffer, 1, sizeof(buffer), f)) > 0) {
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// Check for reading errors so we don't return any data if we couldn't
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// read the entire file (or up to maxsize)
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if (ferror(f))
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return std::make_pair(false,"");
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retval.append(buffer, buffer+n);
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if (retval.size() > maxsize)
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break;
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