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vfs - fix dentry ref count in do_lookup()

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There is a ref count problem in fs/namei.c:do_lookup().

When walking in ref-walk mode, if follow_managed() returns a fail we
need to drop dentry and possibly vfsmount.  Clean up properly,
as we do in the other caller of follow_managed().

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Ian Kent 2011-01-18 12:06:10 +08:00 committed by Al Viro
parent c14cc63a63
commit 8931221411
1 changed files with 3 additions and 1 deletions
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4
fs/namei.c
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@ -1272,8 +1272,10 @@ done:
path->mnt = mnt; path->mnt = mnt;
path->dentry = dentry; path->dentry = dentry;
err = follow_managed(path, nd->flags); err = follow_managed(path, nd->flags);
if (unlikely(err < 0)) if (unlikely(err < 0)) {
path_put_conditional(path, nd);
return err; return err;
}
*inode = path->dentry->d_inode; *inode = path->dentry->d_inode;
return 0; return 0;