From: Miklos Szeredi <mszeredi@suse.cz>

Fix NULL pointer dereference in __mpage_writepage.  This probably
doesn't matter in practice, but this is the original behavior.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---

Index: linux/fs/mpage.c
===================================================================
--- linux.orig/fs/mpage.c	2007-03-06 17:30:09.000000000 +0100
+++ linux/fs/mpage.c	2007-03-06 17:30:33.000000000 +0100
@@ -662,7 +662,7 @@ confused:
 	if (bio)
 		bio = mpage_bio_submit(WRITE, bio);
 
-	if (mpd->use_writepage) {
+	if (mpd->use_writepage && mapping->a_ops->writepage) {
 		ret = mapping->a_ops->writepage(page, wbc);
 	} else {
 		ret = -EAGAIN;

--
-
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