From: Thomas Roessler <roessler@does-not-exist.org>
Date: Wed, 10 Dec 2003 00:48:57 +0000 (+0000)
Subject: Avoid NULL pointer deference in threading code.
X-Git-Tag: mutt-1-5-6-rel~62
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8896cc94635b076d22654576d3b7ba2f01bf942a;p=mutt

Avoid NULL pointer deference in threading code.
---

diff --git a/thread.c b/thread.c
index b26a7878..03409ea4 100644
--- a/thread.c
+++ b/thread.c
@@ -72,7 +72,7 @@ static int need_display_subject (CONTEXT *ctx, HEADER *hdr)
 	return (1);
     }
   }
-  
+
   /* if we have no visible parent or previous sibling, display the subject */
   return (1);
 }
@@ -947,16 +947,19 @@ void mutt_sort_threads (CONTEXT *ctx, int init)
   if (!option (OPTSTRICTTHREADS))
     pseudo_threads (ctx);
 
-  ctx->tree = mutt_sort_subthreads (ctx->tree, init);
-
-  /* restore the oldsort order. */
-  Sort = oldsort;
+  if (ctx->tree)
+  {
+    ctx->tree = mutt_sort_subthreads (ctx->tree, init);
 
-  /* Put the list into an array. */
-  linearize_tree (ctx);
+    /* restore the oldsort order. */
+    Sort = oldsort;
+    
+    /* Put the list into an array. */
+    linearize_tree (ctx);
 
-  /* Draw the thread tree. */
-  mutt_draw_tree (ctx);
+    /* Draw the thread tree. */
+    mutt_draw_tree (ctx);
+  }
 }
 
 static HEADER *find_virtual (THREAD *cur, int reverse)