提交 694a1764 编写于 作者: M Marcin Slusarz 提交者: Al Viro

[patch 3/4] vfs: fix ERR_PTR abuse in generic_readlink

generic_readlink calls ERR_PTR for negative and positive values
(vfs_readlink returns length of "link"), but it should not
(not an errno) and does not need to.
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Acked-by: NMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 20d4fdc1
......@@ -2856,16 +2856,17 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
struct nameidata nd;
void *cookie;
int res;
nd.depth = 0;
cookie = dentry->d_inode->i_op->follow_link(dentry, &nd);
if (!IS_ERR(cookie)) {
int res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
if (IS_ERR(cookie))
return PTR_ERR(cookie);
res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
if (dentry->d_inode->i_op->put_link)
dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
cookie = ERR_PTR(res);
}
return PTR_ERR(cookie);
return res;
}
int vfs_follow_link(struct nameidata *nd, const char *link)
......
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