From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Vecera Subject: [PATCH net-next 14/19] bna: use memdup_user to copy userspace buffers Date: Wed, 10 Jun 2015 18:43:20 +0200 Message-ID: <1433954605-22813-15-git-send-email-ivecera@redhat.com> References: <1433954605-22813-1-git-send-email-ivecera@redhat.com> Cc: rasesh.mody@qlogic.com To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:50671 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965524AbbFJQnO (ORCPT ); Wed, 10 Jun 2015 12:43:14 -0400 In-Reply-To: <1433954605-22813-1-git-send-email-ivecera@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: Patch converts kzalloc->copy_from_user sequence to memdup_user. There is also one useless assignment of NULL to bnad->regdata as it is followed by assignment of kzalloc output. Signed-off-by: Ivan Vecera --- drivers/net/ethernet/brocade/bna/bnad_debugfs.c | 27 ++++++++----------------- 1 file changed, 8 insertions(+), 19 deletions(-) diff --git a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c index 72c8955..ad7af5c 100644 --- a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c +++ b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c @@ -321,15 +321,10 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf, unsigned long flags; void *kern_buf; - /* Allocate memory to store the user space buf */ - kern_buf = kzalloc(nbytes, GFP_KERNEL); - if (!kern_buf) - return -ENOMEM; - - if (copy_from_user(kern_buf, (void __user *)buf, nbytes)) { - kfree(kern_buf); - return -ENOMEM; - } + /* Copy the user space buf */ + kern_buf = memdup_user(buf, nbytes); + if (IS_ERR(kern_buf)) + return PTR_ERR(kern_buf); rc = sscanf(kern_buf, "%x:%x", &addr, &len); if (rc < 2) { @@ -341,7 +336,6 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf, kfree(kern_buf); kfree(bnad->regdata); - bnad->regdata = NULL; bnad->reglen = 0; bnad->regdata = kzalloc(len << 2, GFP_KERNEL); @@ -388,15 +382,10 @@ bnad_debugfs_write_regwr(struct file *file, const char __user *buf, unsigned long flags; void *kern_buf; - /* Allocate memory to store the user space buf */ - kern_buf = kzalloc(nbytes, GFP_KERNEL); - if (!kern_buf) - return -ENOMEM; - - if (copy_from_user(kern_buf, (void __user *)buf, nbytes)) { - kfree(kern_buf); - return -ENOMEM; - } + /* Copy the user space buf */ + kern_buf = memdup_user(buf, nbytes); + if (IS_ERR(kern_buf)) + return PTR_ERR(kern_buf); rc = sscanf(kern_buf, "%x:%x", &addr, &val); if (rc < 2) { -- 2.3.6