[libsoup] Safeguard against NULL in strcmp

[Simon McVittie <smcv src gnome org>]

commit b562f9bbe31b5c5277b2b7d1482d98b5aa42a593
Author: Mark Nauwelaerts <mark nauwelaerts collabora co uk>
Date:   Tue Jan 31 12:02:45 2012 +0100

    Safeguard against NULL in strcmp
    
    [In both of these cases, the situation being guarded against is:
    check_password() is called, but soup_message_headers_get_one() does not find
    an "Authorization" header. -smcv]
    
    Reviewed-by: Simon McVittie <simon mcvittie collabora co uk>
    Reviewed-by: Dan Winship <danw gnome org>
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=669479
    Bug-NB: NB#297634

 libsoup/soup-auth-domain-basic.c  |    2 +-
 libsoup/soup-auth-domain-digest.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libsoup/soup-auth-domain-basic.c b/libsoup/soup-auth-domain-basic.c
index 49f8244..db3d6d5 100644
--- a/libsoup/soup-auth-domain-basic.c
+++ b/libsoup/soup-auth-domain-basic.c
@@ -268,7 +268,7 @@ parse_basic (SoupMessage *msg, const char *header,
 	char *decoded, *colon;
 	gsize len, plen;
 
-	if (strncmp (header, "Basic ", 6) != 0)
+	if (!header || (strncmp (header, "Basic ", 6) != 0))
 		return FALSE;
 
 	decoded = (char *)g_base64_decode (header + 6, &len);
diff --git a/libsoup/soup-auth-domain-digest.c b/libsoup/soup-auth-domain-digest.c
index cee7745..203b9f2 100644
--- a/libsoup/soup-auth-domain-digest.c
+++ b/libsoup/soup-auth-domain-digest.c
@@ -431,7 +431,7 @@ check_password (SoupAuthDomain *domain,
 
 	header = soup_message_headers_get_one (msg->request_headers,
 					       "Authorization");
-	if (strncmp (header, "Digest ", 7) != 0)
+	if (!header || (strncmp (header, "Digest ", 7) != 0))
 		return FALSE;
 
 	params = soup_header_parse_param_list (header + 7);