Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751470AbaLNWtv (ORCPT ); Sun, 14 Dec 2014 17:49:51 -0500 Received: from mail-wg0-f45.google.com ([74.125.82.45]:62265 "EHLO mail-wg0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750751AbaLNWtr (ORCPT ); Sun, 14 Dec 2014 17:49:47 -0500 From: Rickard Strandqvist To: Oleg Drokin , Andreas Dilger Cc: Rickard Strandqvist , Greg Kroah-Hartman , Julia Lawall , Greg Donald , "John L. Hammond" , Andriy Skulysh , Fabian Frederick , James Simmons , HPDD-discuss@ml01.01.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCH] staging: lustre: lustre: obdclass: lprocfs_status.c: Fix for possible null pointer dereference Date: Sun, 14 Dec 2014 23:52:27 +0100 Message-Id: <1418597547-25086-1-git-send-email-rickard_strandqvist@spectrumdigital.se> X-Mailer: git-send-email 1.7.10.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is otherwise a risk of a possible null pointer dereference. Was largely found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist --- .../lustre/lustre/obdclass/lprocfs_status.c | 24 +++++++++++--------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c index 61e04af..5227324 100644 --- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c +++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c @@ -1897,17 +1897,19 @@ int lprocfs_write_frac_u64_helper(const char *buffer, unsigned long count, } units = 1; - switch (*end) { - case 'p': case 'P': - units <<= 10; - case 't': case 'T': - units <<= 10; - case 'g': case 'G': - units <<= 10; - case 'm': case 'M': - units <<= 10; - case 'k': case 'K': - units <<= 10; + if (end) { + switch (*end) { + case 'p': case 'P': + units <<= 10; + case 't': case 'T': + units <<= 10; + case 'g': case 'G': + units <<= 10; + case 'm': case 'M': + units <<= 10; + case 'k': case 'K': + units <<= 10; + } } /* Specified units override the multiplier */ if (units) -- 1.7.10.4 -- 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/