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From: Stephen R. van den Berg <srb@cuci.nl>
Subject: Cater for mails containing an incomplete From_ line.
Bug-Debian: http://bugs.debian.org/769938
X-Debian-version: 3.22-27

--- a/src/from.c
+++ b/src/from.c
@@ -117,7 +117,10 @@
 	      themail.p[extra]='\0';		  /* terminate it for strchr */
 	    }
 	   while(!(rstart=strchr(themail.p,'\n')));
-	   extra=rstart?extra-(++rstart-themail.p):0;
+	   if (rstart)
+	     extra -= ++rstart - themail.p;
+	   else
+	     extra = 0, rstart = themail.p;
 	 }
 	else
 	 { size_t tfrl= ++rstart-themail.p; /* length of existing From_ line */