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-rw-r--r--chrome/nsChromeRegistry.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/chrome/nsChromeRegistry.cpp b/chrome/nsChromeRegistry.cpp
index 0aa7f3f14..e88aca41f 100644
--- a/chrome/nsChromeRegistry.cpp
+++ b/chrome/nsChromeRegistry.cpp
@@ -238,6 +238,12 @@ nsChromeRegistry::Canonify(nsIURL* aChromeURL)
// path is already unescaped once, but uris can get unescaped twice
const char* pos = path.BeginReading();
const char* end = path.EndReading();
+ // Must start with [a-zA-Z0-9].
+ if (!('a' <= *pos && *pos <= 'z') &&
+ !('A' <= *pos && *pos <= 'Z') &&
+ !('0' <= *pos && *pos <= '9')) {
+ return NS_ERROR_DOM_BAD_URI;
+ }
while (pos < end) {
switch (*pos) {
case ':':