diff options
| author |   Al Viro <viro@zeniv.linux.org.uk> | 2020-09-24 19:41:58 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-07 08:01:31 +0200 |
| commit | 27423bb05e251020660e092c2f6b78ad2e4cb9a3 (patch) | |
| tree | 775887f90d5ba994a4739b08a6aa42d6412e5fb3 | |
| parent | epoll: EPOLL_CTL_ADD: close the race in decision to take fast path (diff) | |
| download | wireguard-linux-27423bb05e251020660e092c2f6b78ad2e4cb9a3.tar.xz wireguard-linux-27423bb05e251020660e092c2f6b78ad2e4cb9a3.zip | |
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: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/eventpoll.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 333bb8f9ed0e..339453ac834c 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1453,7 +1453,7 @@ 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) { @@ -1462,8 +1462,9 @@ 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; |