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-rw-r--r--extensions/auth/nsHttpNegotiateAuth.cpp5
1 files changed, 4 insertions, 1 deletions
diff --git a/extensions/auth/nsHttpNegotiateAuth.cpp b/extensions/auth/nsHttpNegotiateAuth.cpp
index adea54b85..8b6be915e 100644
--- a/extensions/auth/nsHttpNegotiateAuth.cpp
+++ b/extensions/auth/nsHttpNegotiateAuth.cpp
@@ -530,8 +530,11 @@ nsHttpNegotiateAuth::GenerateCredentials(nsIHttpAuthenticableChannel *authChanne
challenge++;
len = strlen(challenge);
+ if (!len)
+ return NS_ERROR_UNEXPECTED;
+
// strip off any padding (see bug 230351)
- while (challenge[len - 1] == '=')
+ while (len && challenge[len - 1] == '=')
len--;
//