Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965256Ab3DJXJJ (ORCPT ); Wed, 10 Apr 2013 19:09:09 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:56210 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937301Ab3DJWre (ORCPT ); Wed, 10 Apr 2013 18:47:34 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arnd Bergmann , Jens Axboe Subject: [ 45/64] block: avoid using uninitialized value in from queue_var_store Date: Wed, 10 Apr 2013 15:46:42 -0700 Message-Id: <20130410224343.864144798@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130410224333.114387235@linuxfoundation.org> References: <20130410224333.114387235@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1478 Lines: 45 3.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arnd Bergmann commit c678ef5286ddb5cf70384ad5af286b0afc9b73e1 upstream. As found by gcc-4.8, the QUEUE_SYSFS_BIT_FNS macro creates functions that use a value generated by queue_var_store independent of whether that value was set or not. block/blk-sysfs.c: In function 'queue_store_nonrot': block/blk-sysfs.c:244:385: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] Unlike most other such warnings, this one is not a false positive, writing any non-number string into the sysfs files indeed has an undefined result, rather than returning an error. Signed-off-by: Arnd Bergmann Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-sysfs.c | 2 ++ 1 file changed, 2 insertions(+) --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -229,6 +229,8 @@ queue_store_##name(struct request_queue unsigned long val; \ ssize_t ret; \ ret = queue_var_store(&val, page, count); \ + if (ret < 0) \ + return ret; \ if (neg) \ val = !val; \ \ -- 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/