Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758671AbaGQXL6 (ORCPT ); Thu, 17 Jul 2014 19:11:58 -0400 Received: from mail.ispras.ru ([83.149.199.45]:48286 "EHLO mail.ispras.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755200AbaGQXL4 (ORCPT ); Thu, 17 Jul 2014 19:11:56 -0400 From: Alexey Khoroshilov To: Trond Myklebust Cc: Alexey Khoroshilov , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, ldv-project@linuxtesting.org Subject: [PATCH] NFS: add checks for returned value of try_module_get() Date: Fri, 18 Jul 2014 03:11:45 +0400 Message-Id: <1405638705-320-1-git-send-email-khoroshilov@ispras.ru> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is a couple of places in client code where returned value of try_module_get() is ignored. As a result there is a small chance to premature unload module because of unbalanced refcounting. The patch adds error handling in that places. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov --- fs/nfs/client.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 1d09289c8f0e..a3531fcdc58a 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -110,8 +110,8 @@ struct nfs_subversion *get_nfs_version(unsigned int version) mutex_unlock(&nfs_version_mutex); } - if (!IS_ERR(nfs)) - try_module_get(nfs->owner); + if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) + return ERR_PTR(-EAGAIN); return nfs; } @@ -158,7 +158,8 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) goto error_0; clp->cl_nfs_mod = cl_init->nfs_mod; - try_module_get(clp->cl_nfs_mod->owner); + if (!try_module_get(clp->cl_nfs_mod->owner)) + goto error_dealloc; clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; @@ -190,6 +191,7 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) error_cleanup: put_nfs_version(clp->cl_nfs_mod); +error_dealloc: kfree(clp); error_0: return ERR_PTR(err); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/