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sanitize pathname component hash calculation 

Lift it to lookup_one_len() and link_path_walk() resp. into the
same place where we calculated default hash function of the same
name.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-03-08 14:17:44 -05:00
parent 6a96ba5441
commit 5a202bcd75
1 changed files with 19 additions and 23 deletions
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42
fs/namei.c
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@ -1216,16 +1216,6 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
struct inode *dir;
int err;
/*
* See if the low-level filesystem might want
* to use its own hash..
*/
if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
err = parent->d_op->d_hash(parent, nd->inode, name);
if (err < 0)
return err;
}
/*
* Rename seqlock is not required here because in the off chance
* of a false negative due to a concurrent rename, we're going to
@ -1414,8 +1404,16 @@ static int link_path_walk(const char *name, struct nameidata *nd)
case 1:
type = LAST_DOT;
}
if (likely(type == LAST_NORM))
if (likely(type == LAST_NORM)) {
struct dentry *parent = nd->path.dentry;
nd->flags &= ~LOOKUP_JUMPED;
if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
err = parent->d_op->d_hash(parent, nd->inode,
&this);
if (err < 0)
break;
}
}
/* remove trailing slashes? */
if (!c)
@ -1722,17 +1720,6 @@ static struct dentry *__lookup_hash(struct qstr *name,
if (err)
return ERR_PTR(err);
/*
* See if the low-level filesystem might want
* to use its own hash..
*/
if (base->d_flags & DCACHE_OP_HASH) {
err = base->d_op->d_hash(base, inode, name);
dentry = ERR_PTR(err);
if (err < 0)
goto out;
}
/*
* Don't bother with __d_lookup: callers are for creat as
* well as unlink, so a lot of the time it would cost
@ -1745,7 +1732,7 @@ static struct dentry *__lookup_hash(struct qstr *name,
if (!dentry)
dentry = d_alloc_and_lookup(base, name, nd);
out:
return dentry;
}
@ -1791,6 +1778,15 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
hash = partial_name_hash(c, hash);
}
this.hash = end_name_hash(hash);
/*
* See if the low-level filesystem might want
* to use its own hash..
*/
if (base->d_flags & DCACHE_OP_HASH) {
int err = base->d_op->d_hash(base, base->d_inode, &this);
if (err < 0)
return ERR_PTR(err);
}
return __lookup_hash(&this, base, NULL);
}