From 2e2cbaf920d14de9a96180ddefd6861bcc46f07d Mon Sep 17 00:00:00 2001 From: Al Viro <viro@zeniv.linux.org.uk> Date: Wed, 9 Dec 2020 18:38:24 -0500 Subject: [PATCH] fix hostfs_open() use of ->f_path.dentry this is one of the cases where we need to use d_real() - we are using more than the name of dentry here. ->d_sb is used as well, so in case of hostfs being used as a layer we get the wrong superblock. Reported-by: Johannes Berg <johannes@sipsolutions.net> Tested-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- fs/hostfs/hostfs_kern.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c index c070c0d8e3e97..aea35459d3903 100644 --- a/fs/hostfs/hostfs_kern.c +++ b/fs/hostfs/hostfs_kern.c @@ -315,7 +315,7 @@ static int hostfs_open(struct inode *ino, struct file *file) if (mode & FMODE_WRITE) r = w = 1; - name = dentry_name(file->f_path.dentry); + name = dentry_name(d_real(file->f_path.dentry, file->f_inode)); if (name == NULL) return -ENOMEM; -- GitLab