From: Al Viro viro@zeniv.linux.org.uk
stable inclusion from linux-4.19.150 commit ced8ce5d2157142c469eccc5eef5ea8ad579fa5e
--------------------------------
commit 3701cb59d892b88d569427586f01491552f377b1 upstream.
or get freed, for that matter, if it's a long (separately stored) name.
Signed-off-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- fs/eventpoll.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 59f9d28964ad..cf332e8f6bdf 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -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;