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Bug 1861254 - Safely bail out of LocaleAtomFromPath if passed a bad hyphenation-file path. r=layout-reviewers,emilio

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Differential Revision: https://phabricator.services.mozilla.com/D192934
This commit is contained in:
Jonathan Kew 2023-11-08 10:34:42 +00:00
parent 95f0e10b39
commit d523a6de1b
1 changed files with 14 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

21
intl/hyphenation/glue/nsHyphenationManager.cpp
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@ -203,8 +203,9 @@ void nsHyphenationManager::LoadPatternList() {
// Extract the locale code we'll use to identify a given hyphenation resource
// from the path name as found in omnijar or on disk.
static already_AddRefed<nsAtom> LocaleAtomFromPath(const nsCString& aPath) {
MOZ_ASSERT(StringEndsWith(aPath, ".hyf"_ns) ||
StringEndsWith(aPath, ".dic"_ns));
if (!StringEndsWith(aPath, ".hyf"_ns) && !StringEndsWith(aPath, ".dic"_ns)) {
return nullptr;
}
nsCString locale(aPath);
locale.Truncate(locale.Length() - 4); // strip ".hyf" or ".dic"
locale.Cut(0, locale.RFindChar('/') + 1); // strip directory
@ -212,11 +213,7 @@ static already_AddRefed<nsAtom> LocaleAtomFromPath(const nsCString& aPath) {
if (StringBeginsWith(locale, "hyph_"_ns)) {
locale.Cut(0, 5);
}
for (uint32_t i = 0; i < locale.Length(); ++i) {
if (locale[i] == '_') {
locale.Replace(i, 1, '-');
}
}
locale.ReplaceChar('_', '-');
return NS_Atomize(locale);
}
@ -254,6 +251,9 @@ void nsHyphenationManager::LoadPatternListFromOmnijar(Omnijar::Type aType) {
continue;
}
RefPtr<nsAtom> localeAtom = LocaleAtomFromPath(locale);
if (!localeAtom) {
continue;
}
mPatternFiles.InsertOrUpdate(localeAtom, uri);
}
@ -289,6 +289,9 @@ void nsHyphenationManager::LoadPatternListFromDir(nsIFile* aDir) {
continue;
}
RefPtr<nsAtom> localeAtom = LocaleAtomFromPath(path);
if (!localeAtom) {
continue;
}
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewFileURI(getter_AddRefs(uri), file);
if (NS_SUCCEEDED(rv)) {
@ -345,6 +348,10 @@ void nsHyphenationManager::ShareHyphDictToProcess(
}
RefPtr<nsAtom> localeAtom = LocaleAtomFromPath(path);
if (!localeAtom) {
MOZ_ASSERT_UNREACHABLE("bad path");
return;
}
RefPtr<nsHyphenator> hyph = GetHyphenator(localeAtom);
if (!hyph) {
MOZ_ASSERT_UNREACHABLE("failed to find hyphenator");