[patch added to the 3.12 stable tree] fuse: notify: don't move pages

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From: Miklos Szeredi <mszeredi@xxxxxxx>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit 0d2783626a53d4c922f82d51fa675cb5d13f0d36 upstream.

fuse_try_move_page() is not prepared for replacing pages that have already
been read.

Reported-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 fs/fuse/dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 706e587cbd34..be1f2813c4f0 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1725,6 +1725,9 @@ copy_finish:
 static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
 		       unsigned int size, struct fuse_copy_state *cs)
 {
+	/* Don't try to move pages (yet) */
+	cs->move_pages = 0;
+
 	switch (code) {
 	case FUSE_NOTIFY_POLL:
 		return fuse_notify_poll(fc, size, cs);
-- 
2.3.3

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