From 408ef013cc9e2f94a14f7ccbbe52ddfb18437a99 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 18 Jun 2012 10:47:03 -0400 Subject: [PATCH] fs: move path_put on failure out of ->follow_link Currently the non-nd_set_link based versions of ->follow_link are expected to do a path_put(&nd->path) on failure. This calling convention is unexpected, undocumented and doesn't match what the nd_set_link-based instances do. Move the path_put out of the only non-nd_set_link based ->follow_link instance into the caller. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/namei.c | 3 +-- fs/proc/base.c | 12 ++++++++---- 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 6b29a51bef5d..a9b94c62c303 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -624,7 +624,7 @@ follow_link(struct path *link, struct nameidata *nd, void **p) *p = dentry->d_inode->i_op->follow_link(dentry, nd); error = PTR_ERR(*p); if (IS_ERR(*p)) - goto out_put_link; + goto out_put_nd_path; error = 0; s = nd_get_link(nd); @@ -646,7 +646,6 @@ follow_link(struct path *link, struct nameidata *nd, void **p) out_put_nd_path: path_put(&nd->path); -out_put_link: path_put(link); return error; } diff --git a/fs/proc/base.c b/fs/proc/base.c index 8eaa5ea1c613..3bd5ac1ff018 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1427,16 +1427,20 @@ static int proc_exe_link(struct dentry *dentry, struct path *exe_path) static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) { struct inode *inode = dentry->d_inode; + struct path path; int error = -EACCES; - /* We don't need a base pointer in the /proc filesystem */ - path_put(&nd->path); - /* Are we allowed to snoop on the tasks file descriptors? */ if (!proc_fd_access_allowed(inode)) goto out; - error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path); + error = PROC_I(inode)->op.proc_get_link(dentry, &path); + if (error) + goto out; + + path_put(&nd->path); + nd->path = path; + return NULL; out: return ERR_PTR(error); } -- 2.30.2