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[PATCH] fuse: fix dereferencing dentry parent

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There's no locking for ->d_revalidate, so fuse_dentry_revalidate() should use
dget_parent() instead of simply dereferencing ->d_parent.

Due to topology changes in the directory tree the parent could become negative
or be destroyed while being used.  There hasn't been any reports about this
yet.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2006-10-17 00:10:12 -07:00 committed by Linus Torvalds
parent d2a85164aa
commit e956edd052
1 changed files with 4 additions and 1 deletions
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5
fs/fuse/dir.c
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@ -138,6 +138,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
struct fuse_entry_out outarg;
struct fuse_conn *fc;
struct fuse_req *req;
struct dentry *parent;
/* Doesn't hurt to "reset" the validity timeout */
fuse_invalidate_entry_cache(entry);
@ -151,8 +152,10 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
if (IS_ERR(req))
return 0;
fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
parent = dget_parent(entry);
fuse_lookup_init(req, parent->d_inode, entry, &outarg);
request_send(fc, req);
dput(parent);
err = req->out.h.error;
/* Zero nodeid is same as -ENOENT */
if (!err && !outarg.nodeid)