Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932884AbbKLXXF (ORCPT ); Thu, 12 Nov 2015 18:23:05 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:45666 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932737AbbKLXUA (ORCPT ); Thu, 12 Nov 2015 18:20:00 -0500 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: =?UTF-8?q?D=C4=81vis=20Mos=C4=81ns?= , James Bottomley , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 146/155] mvsas: Fix NULL pointer dereference in mvs_slot_task_free Date: Thu, 12 Nov 2015 15:18:20 -0800 Message-Id: <1447370309-357-147-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1447370309-357-1-git-send-email-kamal@canonical.com> References: <1447370309-357-1-git-send-email-kamal@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Extended-Stable: 3.19 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1609 Lines: 45 3.19.8-ckt10 -stable review patch. If anyone has any objections, please let me know. ------------------ From: =?UTF-8?q?D=C4=81vis=20Mos=C4=81ns?= commit 2280521719e81919283b82902ac24058f87dfc1b upstream. When pci_pool_alloc fails in mvs_task_prep then task->lldd_task stays NULL but it's later used in mvs_abort_task as slot which is passed to mvs_slot_task_free causing NULL pointer dereference. Just return from mvs_slot_task_free when passed with NULL slot. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=101891 Signed-off-by: Dāvis Mosāns Reviewed-by: Tomas Henzl Reviewed-by: Johannes Thumshirn Signed-off-by: James Bottomley Signed-off-by: Kamal Mostafa --- drivers/scsi/mvsas/mv_sas.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c index 454536c..9c78074 100644 --- a/drivers/scsi/mvsas/mv_sas.c +++ b/drivers/scsi/mvsas/mv_sas.c @@ -887,6 +887,8 @@ static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc) static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task, struct mvs_slot_info *slot, u32 slot_idx) { + if (!slot) + return; if (!slot->task) return; if (!sas_protocol_ata(task->task_proto)) -- 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/