From: Jesper Juhl <jesper.juhl@gmail.com>
Date: Fri, 27 Jul 2007 23:13:33 +0000 (+0200)
Subject: [SCSI] libsas: Fix potential NULL dereference in sas_smp_get_phy_events()
X-Git-Tag: v2.6.23-rc2~164^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92631fa4d0afa64b82144eab714fbf2f4049dabe;p=linux-2.6

[SCSI] libsas: Fix potential NULL dereference in sas_smp_get_phy_events()

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.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
---

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 8603ae6521..8727436b22 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);
 
-	if (!resp)
+	req = alloc_smp_req(RPEL_REQ_SIZE);
+	if (!req)
 		return -ENOMEM;
 
+	resp = alloc_smp_resp(RPEL_RESP_SIZE);
+	if (!resp) {
+		kfree(req);
+		return -ENOMEM;
+	}
+
 	req[1] = SMP_REPORT_PHY_ERR_LOG;
 	req[9] = phy->number;