netdev - [PATCH net-next 1/2] enic: reset fetch index

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1509035405-20497-1-git-send-email-pkaustub@cisco.com>
Date:   Thu, 26 Oct 2017 09:30:04 -0700
From:   Parvi Kaustubhi <pkaustub@...co.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     gvaradar@...co.com, benve@...co.com,
        Parvi Kaustubhi <pkaustub@...co.com>
Subject: [PATCH net-next 1/2] enic: reset fetch index

Since we are allowing rx ring size modification, reset fetch index
everytime. Otherwise it could have a stale value that can lead to a null
pointer dereference.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@...co.com>
Signed-off-by: Parvi Kaustubhi <pkaustub@...co.com>
---
 drivers/net/ethernet/cisco/enic/vnic_rq.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/cisco/enic/vnic_rq.c b/drivers/net/ethernet/cisco/enic/vnic_rq.c
index 36bc2c7..90537d9 100644
--- a/drivers/net/ethernet/cisco/enic/vnic_rq.c
+++ b/drivers/net/ethernet/cisco/enic/vnic_rq.c
@@ -141,18 +141,8 @@ void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
 {
 	u32 fetch_index = 0;
 
-	/* Use current fetch_index as the ring starting point */
-	fetch_index = ioread32(&rq->ctrl->fetch_index);
-
-	if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
-		/* Hardware surprise removal: reset fetch_index */
-		fetch_index = 0;
-	}
-
-	vnic_rq_init_start(rq, cq_index,
-		fetch_index, fetch_index,
-		error_interrupt_enable,
-		error_interrupt_offset);
+	vnic_rq_init_start(rq, cq_index, 0, 0, error_interrupt_enable,
+			   error_interrupt_offset);
 }
 
 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
-- 
1.8.3.1