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add upper-bounds check for valid hex characters

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This commit is contained in:
Tim Aitken 2024-02-20 12:40:59 -08:00
parent 157b166e23
commit 7a74a996f3
1 changed files with 3 additions and 3 deletions
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6
src/lib_json/json_reader.cpp
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@ -1692,11 +1692,11 @@ bool OurReader::decodeHexadecimal(Token& token, Value& decoded) {
return addError("Token too long to be unsigned integer.", token, current);
for (; current < token.end_; ++current) {
Char c = *current;
if (c >= 'a')
if (c >= 'a' && c <= 'f')
c -= 'a' - 10;
else if (c >= 'A')
else if (c >= 'A' && c <= 'F')
c -= 'A' - 10;
else if (c >= '0')
else if (c >= '0' && c <= '9')
c -= '0';
else
return addError("Contains non-hexadecimal digits.", token, current);