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vfs: fix reference leak in d_prune_aliases()

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In "d_prune_alias(): just lock the parent and call __dentry_kill()" the old
dget + d_drop + dput has been replaced with lock_parent + __dentry_kill;
unfortunately, dput() does more than just killing dentry - it also drops the
reference to parent.  New variant leaks that reference and needs dput(parent)
after killing the child off.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Yan, Zheng 2014-11-19 15:50:34 +08:00 committed by Al Viro
parent ad0eab9293
commit 4a7795d35e
1 changed files with 1 additions and 0 deletions
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fs/dcache.c
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@ -778,6 +778,7 @@ void d_prune_aliases(struct inode *inode)
struct dentry *parent = lock_parent(dentry);
if (likely(!dentry->d_lockref.count)) {
__dentry_kill(dentry);
dput(parent);
goto restart;
}
if (parent)