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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 <viro@zeniv.linux.org.uk>
hifive-unleashed-5.1
Al Viro 2015-05-10 11:50:01 -04:00
parent 1cf2665b5b
commit ab10492345
1 changed files with 4 additions and 7 deletions
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11
fs/namei.c
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@ -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;
}