9p: Check for NULL fid in v9fs_dir_release()

NULL fid should be handled in cases where we endup calling v9fs_dir_release()
before even we instantiate the fid in filp.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 16c8a2a98c1bb6b93fbc8634cb1986cf555bad0e..899f168fd19cc4d4aca48e6d26e51aa08b34db59 100644 (file)
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -292,9 +292,11 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
 
        fid = filp->private_data;
        P9_DPRINTK(P9_DEBUG_VFS,
-                       "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
+                       "v9fs_dir_release: inode: %p filp: %p fid: %d\n",
+                       inode, filp, fid ? fid->fid : -1);
        filemap_write_and_wait(inode->i_mapping);
-       p9_client_clunk(fid);
+       if (fid)
+               p9_client_clunk(fid);
        return 0;
 }