fix oops on cat /dev/snapshot

[Pavel Machek]

What /dev/snapshot is simply cat-ed -- without ioctls used in normal
operation -- it oopses. This one should fix it.

Signed-off-by: Pavel Machek <pavel@xxxxxxx>

--- clean-mm/kernel/power/user.c	2007-06-09 16:18:12.000000000 +0200
+++ linux-mm/kernel/power/user.c	2007-06-11 14:06:19.000000000 +0200
@@ -99,6 +99,8 @@
 	ssize_t res;
 
 	data = filp->private_data;
+	if (!data->ready)
+		return -EINVAL;
 	res = snapshot_read_next(&data->handle, count);
 	if (res > 0) {
 		if (copy_to_user(buf, data_of(data->handle), res))

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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