[gupnp-av] Fixed a potential memory corruption error in parse_additional_inf.

[Jens Georg <jensgeorg src gnome org>]

commit 1ab4c1a11e0c6a1c60aa01698ddb21e11eb62978
Author: Mark Ryan <mark d ryan intel com>
Date:   Wed Apr 18 14:48:08 2012 +0200

    Fixed a potential memory corruption error in parse_additional_inf.
    
    This occurs in the "DLNA.ORG_FLAGS=" portion of the protocol info
    is < 8 bytes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=674322

 libgupnp-av/gupnp-protocol-info.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgupnp-av/gupnp-protocol-info.c b/libgupnp-av/gupnp-protocol-info.c
index e7a933f..b8ac451 100644
--- a/libgupnp-av/gupnp-protocol-info.c
+++ b/libgupnp-av/gupnp-protocol-info.c
@@ -146,8 +146,8 @@ parse_additional_info (const char        *additional_info,
                                   "DLNA.ORG_FLAGS=");
                 if (p != NULL) {
                         p += 15; /* end of "DLNA.ORG_FLAGS=" */
-
-                        p[8] = '\0';
+                        if (strlen (p) > 8)
+                                p[8] = '\0';
                         gupnp_protocol_info_set_dlna_flags
                                                         (info,
                                                          strtoul (p, NULL, 16));