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[PATCH] d_instantiate_unique / NFS inode leakage

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If we have found aliased dentry that we return, inode reference is not
dropped and inode is not attached anywhere, so it seems the reference to
inode is leaked in that case.

Cc: Trond Myklebust <trond.myklebust@fys.uio.no>,
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Drokin 2006-01-09 20:52:51 -08:00 committed by Linus Torvalds
parent 632d6407af
commit e866cfa939
1 changed files with 6 additions and 1 deletions
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7
fs/dcache.c
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@ -808,10 +808,14 @@ void d_instantiate(struct dentry *entry, struct inode * inode)
*
* Fill in inode information in the entry. On success, it returns NULL.
* If an unhashed alias of "entry" already exists, then we return the
* aliased dentry instead.
* aliased dentry instead and drop one reference to inode.
*
* Note that in order to avoid conflicts with rename() etc, the caller
* had better be holding the parent directory semaphore.
*
* This also assumes that the inode count has been incremented
* (or otherwise set) by the caller to indicate that it is now
* in use by the dcache.
*/
struct dentry *d_instantiate_unique(struct dentry *entry, struct inode *inode)
{
@ -838,6 +842,7 @@ struct dentry *d_instantiate_unique(struct dentry *entry, struct inode *inode)
dget_locked(alias);
spin_unlock(&dcache_lock);
BUG_ON(!d_unhashed(alias));
iput(inode);
return alias;
}
list_add(&entry->d_alias, &inode->i_dentry);