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-rw-r--r--netwerk/protocol/http/nsHttpNTLMAuth.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/netwerk/protocol/http/nsHttpNTLMAuth.cpp b/netwerk/protocol/http/nsHttpNTLMAuth.cpp
index aa5b1f8f7..86bfcf4d1 100644
--- a/netwerk/protocol/http/nsHttpNTLMAuth.cpp
+++ b/netwerk/protocol/http/nsHttpNTLMAuth.cpp
@@ -486,8 +486,8 @@ nsHttpNTLMAuth::GenerateCredentials(nsIHttpAuthenticableChannel *authChannel,
len -= 5;
// strip off any padding (see bug 230351)
- while (challenge[len - 1] == '=')
- len--;
+ while (len && challenge[len - 1] == '=')
+ len--;
// decode into the input secbuffer
rv = Base64Decode(challenge, len, (char**)&inBuf, &inBufLen);