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Commit ced8ce5d authored by Al Viro's avatar Al Viro Committed by Greg Kroah-Hartman
Browse files

ep_create_wakeup_source(): dentry name can change under you... 



commit 3701cb59d892b88d569427586f01491552f377b1 upstream.

or get freed, for that matter, if it's a long (separately stored)
name.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 90ef231b

fs/eventpoll.c

+4 −3
Original line number Diff line number Diff line
@@ -1376,7 +1376,7 @@ static int reverse_path_check(void) 


static int ep_create_wakeup_source(struct epitem *epi)

{

	const char *name;

	struct name_snapshot n;

	struct wakeup_source *ws;



	if (!epi->ep->ws) {
@@ -1385,8 +1385,9 @@ static int ep_create_wakeup_source(struct epitem *epi) 
			return -ENOMEM;

	}



	name = epi->ffd.file->f_path.dentry->d_name.name;

	ws = wakeup_source_register(name);

	take_dentry_name_snapshot(&n, epi->ffd.file->f_path.dentry);

	ws = wakeup_source_register(n.name);

	release_dentry_name_snapshot(&n);



	if (!ws)

		return -ENOMEM;