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make sure to check array bounds in VirtualizedSectionList #23710

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make sure to check array bounds in VirtualizedSectionList #23710

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b43a7be
make sure to check array bounds
vonovak Mar 1, 2019
dcf8519
fix lint
vonovak Mar 1, 2019
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21 changes: 12 additions & 9 deletions Libraries/Lists/VirtualizedSectionList.js
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Original file line number Diff line number Diff line change
Expand Up @@ -221,9 +221,9 @@ class VirtualizedSectionList<SectionT: SectionBase> extends React.PureComponent<
trailingSection?: ?SectionT,
} {
let itemIndex = index;
const defaultKeyExtractor = this.props.keyExtractor;
for (let ii = 0; ii < this.props.sections.length; ii++) {
const section = this.props.sections[ii];
const {sections} = this.props;
for (let ii = 0; ii < sections.length; ii++) {
const section = sections[ii];
const key = section.key || String(ii);
itemIndex -= 1; // The section adds an item for the header
if (itemIndex >= section.data.length + 1) {
Expand All @@ -234,26 +234,29 @@ class VirtualizedSectionList<SectionT: SectionBase> extends React.PureComponent<
key: key + ':header',
index: null,
header: true,
trailingSection: this.props.sections[ii + 1],
trailingSection: sections[ii + 1],
};
} else if (itemIndex === section.data.length) {
return {
section,
key: key + ':footer',
index: null,
header: false,
trailingSection: this.props.sections[ii + 1],
trailingSection: sections[ii + 1],
};
} else {
const keyExtractor = section.keyExtractor || defaultKeyExtractor;
const keyExtractor = section.keyExtractor || this.props.keyExtractor;
return {
section,
key: key + ':' + keyExtractor(section.data[itemIndex], itemIndex),
index: itemIndex,
leadingItem: section.data[itemIndex - 1],
leadingSection: this.props.sections[ii - 1],
trailingItem: section.data[itemIndex + 1],
trailingSection: this.props.sections[ii + 1],
leadingSection: sections[ii - 1],
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trailingItem:
section.data.length > itemIndex + 1
? section.data[itemIndex + 1]
: undefined,
trailingSection: sections[ii + 1],
};
}
}
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