[JFFS2] Fix oops when marking space dirty in scan, but no previous node exists.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
index 5d36e9b..927dfe4 100644 (file)
--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -1139,7 +1139,7 @@ int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb
                BUG();
        }
        /* REF_EMPTY_NODE is !obsolete, so that works OK */
-       if (ref_obsolete(jeb->last_node)) {
+       if (jeb->last_node && ref_obsolete(jeb->last_node)) {
 #ifdef TEST_TOTLEN
                jeb->last_node->__totlen += size;
 #endif