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| 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 08:00:09 +0200 |
| commit | ced8ce5d2157142c469eccc5eef5ea8ad579fa5e (patch) | |
| tree | 18f4bff926582cceaf81baefc5fc614a815f2a49 | |
| parent | 90ef231ba534d43033884b8560df26e608ca0a21 (diff) | |
| download | linux-stable-ced8ce5d2157142c469eccc5eef5ea8ad579fa5e.tar.gz linux-stable-ced8ce5d2157142c469eccc5eef5ea8ad579fa5e.tar.bz2 linux-stable-ced8ce5d2157142c469eccc5eef5ea8ad579fa5e.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 c4c833bad4b7..a4a32b79e832 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; |