From ab10492345d1d629743c7e7d56532f4e5284c2c5 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 10 May 2015 11:50:01 -0400 Subject: [PATCH] namei: take increment of nd->depth into pick_link() Makes the situation much more regular - we avoid a strange state when the element just after the top of stack is used to store struct path of symlink, but isn't counted in nd->depth. This is much more regular, so the normal failure exits, etc., work fine. Signed-off-by: Al Viro --- fs/namei.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 277ca86fc6c6..6d4692d772f7 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -798,8 +798,7 @@ static inline int may_follow_link(struct nameidata *nd) return 0; audit_log_link_denied("follow_link", &nd->stack[0].link); - path_put(&nd->stack[0].link); - path_put(&nd->path); + terminate_walk(nd); return -EACCES; } @@ -875,7 +874,7 @@ static int may_linkat(struct path *link) static __always_inline const char *get_link(struct nameidata *nd) { - struct saved *last = nd->stack + nd->depth; + struct saved *last = nd->stack + nd->depth - 1; struct dentry *dentry = last->link.dentry; struct inode *inode = dentry->d_inode; int error; @@ -883,9 +882,6 @@ const char *get_link(struct nameidata *nd) BUG_ON(nd->flags & LOOKUP_RCU); - last->cookie = NULL; - nd->depth++; - cond_resched(); touch_atime(&last->link); @@ -1575,8 +1571,9 @@ static int pick_link(struct nameidata *nd, struct path *link) return error; } - last = nd->stack + nd->depth; + last = nd->stack + nd->depth++; last->link = *link; + last->cookie = NULL; return 1; } -- 2.30.2