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| author | Marcin Slusarz <marcin.slusarz@gmail.com> | 2008-06-09 16:40:37 -0700 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-06-23 11:52:30 -0400 |
| commit | 694a1764d657e0f7a9b139bc7269c8d5f5a2534b (patch) | |
| tree | 754e073cce539c3b6f93e61c3f729bc5959f12f4 /fs/namei.c | |
| parent | 20d4fdc1a788e4ca0aaf2422772ba668e7e10839 (diff) | |
| download | lwn-694a1764d657e0f7a9b139bc7269c8d5f5a2534b.tar.gz lwn-694a1764d657e0f7a9b139bc7269c8d5f5a2534b.zip | |
[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: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Acked-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/namei.c b/fs/namei.c index ee1544696e83..01e67dddcc3d 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -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 (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); + 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); + return res; } int vfs_follow_link(struct nameidata *nd, const char *link) |