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Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c27
-rw-r--r--fs/proc/base.c3
2 files changed, 18 insertions, 12 deletions
diff --git a/fs/namei.c b/fs/namei.c
index a9b94c62c303..0e1b9c3eb36d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -586,6 +586,21 @@ static inline void path_to_nameidata(const struct path *path,
nd->path.dentry = path->dentry;
}
+/*
+ * Helper to directly jump to a known parsed path from ->follow_link,
+ * caller must have taken a reference to path beforehand.
+ */
+void nd_jump_link(struct nameidata *nd, struct path *path)
+{
+ path_put(&nd->path);
+
+ nd->path = *path;
+ nd->inode = nd->path.dentry->d_inode;
+ nd->flags |= LOOKUP_JUMPED;
+
+ BUG_ON(nd->inode->i_op->follow_link);
+}
+
static inline void put_link(struct nameidata *nd, struct path *link, void *cookie)
{
struct inode *inode = link->dentry->d_inode;
@@ -630,17 +645,9 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
s = nd_get_link(nd);
if (s) {
error = __vfs_follow_link(nd, s);
- } else if (nd->last_type == LAST_BIND) {
- nd->flags |= LOOKUP_JUMPED;
- nd->inode = nd->path.dentry->d_inode;
- if (nd->inode->i_op->follow_link) {
- /* stepped on a _really_ weird one */
- path_put(&nd->path);
- error = -ELOOP;
- }
+ if (unlikely(error))
+ put_link(nd, link, *p);
}
- if (unlikely(error))
- put_link(nd, link, *p);
return error;
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3bd5ac1ff018..2772208338f8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1438,8 +1438,7 @@ static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
if (error)
goto out;
- path_put(&nd->path);
- nd->path = path;
+ nd_jump_link(nd, &path);
return NULL;
out:
return ERR_PTR(error);