From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Juhl Subject: [PATCH][sas] Fix potential NULL pointer dereference bug in sas_smp_get_phy_events() Date: Fri, 27 Jul 2007 23:27:57 +0200 Message-ID: <200707272327.57356.jesper.juhl@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from ik-out-1112.google.com ([66.249.90.183]:19614 "EHLO ik-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761271AbXG0V3P (ORCPT ); Fri, 27 Jul 2007 17:29:15 -0400 Received: by ik-out-1112.google.com with SMTP id b32so751746ika for ; Fri, 27 Jul 2007 14:29:12 -0700 (PDT) Content-Disposition: inline Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: Luben Tuikov , James Bottomley , Linux Kernel Mailing List , Jesper Juhl Hello, In sas_smp_get_phy_events() we never test if the call to alloc_smp_req(RPEL_REQ_SIZE) succeeds or fails. That means we run the risk of dereferencing a NULL pointer if it does fail. Far better to test if we got NULL back and in that case return -ENOMEM just as we already do for the other memory allocation in that function. This patch reworks the memory allocation a bit to deal with it (compile tested only). Signed-off-by: Jesper Juhl --- drivers/scsi/libsas/sas_expander.c | 11 +++++++++-- 1 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index b500f0c..85f5145 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -507,14 +507,21 @@ static int sas_dev_present_in_domain(struct asd_sas_port *port, int sas_smp_get_phy_events(struct sas_phy *phy) { int res; + u8 *req; + u8 *resp; struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); struct domain_device *dev = sas_find_dev_by_rphy(rphy); - u8 *req = alloc_smp_req(RPEL_REQ_SIZE); - u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL); + resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL); if (!resp) return -ENOMEM; + req = alloc_smp_req(RPEL_REQ_SIZE); + if (!req) { + res = -ENOMEM; + goto out; + } + req[1] = SMP_REPORT_PHY_ERR_LOG; req[9] = phy->number; PS. Please keep me on Cc when replying.