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Fix mountpoint reference leakage in linkat 

Recent changes to retry on ESTALE in linkat
(commit 442e31ca5a)
introduced a mountpoint reference leak and a small memory
leak in case a filesystem link operation returns ESTALE
which is pretty normal for distributed filesystems like
lustre, nfs and so on.
Free old_path in such a case.

[AV: there was another missing path_put() nearby - on the previous
goto retry]

Signed-off-by: Oleg Drokin: <green@linuxhacker.ru>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Oleg Drokin 2014-01-31 15:41:58 -05:00 committed by Al Viro
parent b168fff721
commit d22e6338db
1 changed files with 4 additions and 1 deletions
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5
fs/namei.c
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@ -3926,10 +3926,13 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
done_path_create(&new_path, new_dentry);
if (delegated_inode) {
error = break_deleg_wait(&delegated_inode);
if (!error)
if (!error) {
path_put(&old_path);
goto retry;
}
}
if (retry_estale(error, how)) {
path_put(&old_path);
how |= LOOKUP_REVAL;
goto retry;
}