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Bug 1606721 - Fix crash on screen reader text requests with bogus offsets, r=Jamie

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Differential Revision: https://phabricator.services.mozilla.com/D82424
This commit is contained in:
Samuel Thibault 2020-07-08 22:46:28 +00:00
parent 08cdd6ddc7
commit 667bd111f3
1 changed files with 6 additions and 0 deletions
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6
accessible/atk/DOMtoATK.h
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@ -122,6 +122,12 @@ gchar* NewATKString(AccessibleOrProxy* aAccessible, gint aStartOffset,
gint(aAccessible->CharacterCount()));
nsAutoString str;
aAccessible->TextSubstring(startOffset, endOffset, str);
if (str.Length() == 0) {
// Bogus offsets, or empty string, either way we do not need conversion.
return g_strdup("");
}
if (aFlags & AtkStringConvertFlags::ConvertTextToAsterisks)
ConvertTexttoAsterisks(str);
return converter.ConvertAdjusted(str);