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Issue #2489: Disallow percentage overflow and underflow

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erixreyes 2025-07-26 05:51:57 +08:00 • committed by roytam1
commit 052b5d1ffa
1 changed files with 10 additions and 6 deletions
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16
layout/style/nsCSSParser.cpp
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@ -7491,9 +7491,11 @@ CSSParserImpl::ParseColor(nsCSSValue& aValue)
if (mToken.mType == eCSSToken_Percentage) {
w1 = mToken.mNumber; // percentage tokens are already normalized (0.0-1.0)
w1_specified = true;
// clamp to valid range [0, 1]
if (w1 < 0.0f) w1 = 0.0f;
if (w1 > 1.0f) w1 = 1.0f;
// Reject invalid percentages (outside 0-100% range)
if (w1 < 0.0f || w1 > 1.0f) {
SkipUntil(')');
return CSSParseResult::Error;
}
} else {
UngetToken();
}
@ -7517,9 +7519,11 @@ CSSParserImpl::ParseColor(nsCSSValue& aValue)
if (mToken.mType == eCSSToken_Percentage) {
w2 = mToken.mNumber; // percentage tokens are already normalized (0.0-1.0)
w2_specified = true;
// Clamp to valid range [0, 1]
if (w2 < 0.0f) w2 = 0.0f;
if (w2 > 1.0f) w2 = 1.0f;
// Reject invalid percentages (outside 0-100% range)
if (w2 < 0.0f || w2 > 1.0f) {
SkipUntil(')');
return CSSParseResult::Error;
}
} else {
UngetToken();
}