[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-kernel
Subject:    [PATCH][next] netdevsim: fix sa_idx out of bounds check
From:       Colin King <colin.king () canonical ! com>
Date:       2018-06-30 20:39:24
Message-ID: 20180630203924.5121-1-colin.king () canonical ! com
[Download RAW message or body]

From: Colin Ian King <colin.king@canonical.com>

Currently if sa_idx is equal to NSIM_IPSEC_MAX_SA_COUNT then
an out-of-bounds read on ipsec->sa will occur. Fix the
incorrect bounds check by using >= rather than >.

Detected by CoverityScan, CID#1470226 ("Out-of-bounds-read")

Fixes: 7699353da875 ("netdevsim: add ipsec offload testing")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/netdevsim/ipsec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/netdevsim/ipsec.c b/drivers/net/netdevsim/ipsec.c
index ceff544510b9..2dcf6cc269d0 100644
--- a/drivers/net/netdevsim/ipsec.c
+++ b/drivers/net/netdevsim/ipsec.c
@@ -249,7 +249,7 @@ bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
 	}
 
 	sa_idx = xs->xso.offload_handle & ~NSIM_IPSEC_VALID;
-	if (unlikely(sa_idx > NSIM_IPSEC_MAX_SA_COUNT)) {
+	if (unlikely(sa_idx >= NSIM_IPSEC_MAX_SA_COUNT)) {
 		netdev_err(ns->netdev, "bad sa_idx=%d max=%d\n",
 			   sa_idx, NSIM_IPSEC_MAX_SA_COUNT);
 		return false;
-- 
2.17.1

[prev in list] [next in list] [prev in thread] [next in thread]