Commit 3701cb59 authored by Al Viro's avatar Al Viro
Browse files

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



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>
parent fe0a916c

fs/eventpoll.c

+4 −3
Original line number Diff line number Diff line
@@ -1448,7 +1448,7 @@ 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) {
@@ -1457,8 +1457,9 @@ 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(NULL, name);

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

	ws = wakeup_source_register(NULL, n.name.name);

	release_dentry_name_snapshot(&n);



	if (!ws)

		return -ENOMEM;