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-rw-r--r--extensions/common/url_pattern.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/extensions/common/url_pattern.cc b/extensions/common/url_pattern.cc
index ee7d164..b667981 100644
--- a/extensions/common/url_pattern.cc
+++ b/extensions/common/url_pattern.cc
@@ -228,6 +228,11 @@ URLPattern::ParseResult URLPattern::Parse(const std::string& pattern) {
// The first component can optionally be '*' to match all subdomains.
std::vector<std::string> host_components;
base::SplitString(host_, '.', &host_components);
+
+ // Could be empty if the host only consists of whitespace characters.
+ if (host_components.empty())
+ return PARSE_ERROR_EMPTY_HOST;
+
if (host_components[0] == "*") {
match_subdomains_ = true;
host_components.erase(host_components.begin(),