From b6b08e40b38b098e796c2846c150befc8cc2c350 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Mon, 24 Sep 2012 17:21:20 +0200
Subject: [PATCH] Avoid potentially dereferencing a NULL pointer

GMIME_IS_MULTIPART and GMIME_IS_MESSAGE both handle NULL pointers
gracefully, but the G_OBJECT_TYPE used in the error handling block
dereferences it without checking it first.

Fix this by checking whether parent->part is valid.

Found using the clang static analyzer.

Signed-off-by: Justus Winter <4winter@informatik.uni-hamburg.de>
---
 mime-node.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mime-node.c b/mime-node.c
index 97e8b480..839737a8 100644
--- a/mime-node.c
+++ b/mime-node.c
@@ -291,7 +291,7 @@ mime_node_child (mime_node_t *parent, int child)
     GMimeObject *sub;
     mime_node_t *node;
 
-    if (!parent || child < 0 || child >= parent->nchildren)
+    if (!parent || !parent->part || child < 0 || child >= parent->nchildren)
 	return NULL;
 
     if (GMIME_IS_MULTIPART (parent->part)) {