linux-kernel - [PATCH] i40e: check that pointer vsi is not null before dereferencing it

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Message-Id: <20180215195052.29037-1-colin.king@canonical.com>
Date:   Thu, 15 Feb 2018 19:50:52 +0000
From:   Colin King <colin.king@...onical.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] i40e: check that pointer vsi is not null before dereferencing it

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

Function i40e_find_vsi_from_id can potentially return null, hence
vsi may be null, so defensively check it is non-null before
dereferencing it to check the seid.

Fixes: e284fc280473 ("i40e: Add and delete cloud filter")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 5cca083da93c..14bbd5c1db78 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -3062,7 +3062,7 @@ static struct i40e_vsi *i40e_find_vsi_from_seid(struct i40e_vf *vf, u16 seid)
 
 	for (i = 0; i < vf->num_tc ; i++) {
 		vsi = i40e_find_vsi_from_id(pf, vf->ch[i].vsi_id);
-		if (vsi->seid == seid)
+		if (vsi && vsi->seid == seid)
 			return vsi;
 	}
 	return NULL;
-- 
2.15.1