Fix the segfault in get_calleridname if the From: string starts with "<sip:..."

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1079 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 5c14899..58ef453 100755 (executable)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -3326,7 +3326,7 @@ static char *get_calleridname(char *input,char *output)
 {
        char *end = strchr(input,'<');
        char *tmp = strchr(input,'\"');
-       if (!end) return NULL;
+       if (!end || (end == input)) return NULL;
        /* move away from "<" */
        end--;
        /* we found "name" */
@@ -3342,7 +3342,10 @@ static char *get_calleridname(char *input,char *output)
                /* clear the empty characters in the end */
                while(*end && (*end < 33) && end > input)
                        end--;
-               strncpy(output,input,(int)(end-input));
+               if (end > input)
+                       strncpy(output,input,(int)(end-input));
+               else
+                       output = NULL;
        }
        return output;
 }