linux-kernel - [PATCH] qede: fix null pointer dereference on skb on allocation failure

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Message-Id: <20180801163947.22743-1-colin.king@canonical.com>
Date:   Wed,  1 Aug 2018 17:39:47 +0100
From:   Colin King <colin.king@...onical.com>
To:     Ariel Elior <Ariel.Elior@...ium.com>, everest-linux-l2@...ium.com,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] qede: fix null pointer dereference on skb on allocation failure

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

If skb fails to be allocated with the call to build_skb then a
null pointer dereference will occur on the call to skb_reserve.
Fix this by checking for a null skb and returning NULL.

Detected by CoverityScan, CID#1469485 ("Dereference null return value")

Fixes: 8a8633978b84 ("qede: Add build_skb() support.")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/ethernet/qlogic/qede/qede_fp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_fp.c b/drivers/net/ethernet/qlogic/qede/qede_fp.c
index 6c702399b801..4b912ff5c0f3 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_fp.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_fp.c
@@ -730,6 +730,8 @@ qede_build_skb(struct qede_rx_queue *rxq,
 
 	buf = page_address(bd->data) + bd->page_offset;
 	skb = build_skb(buf, rxq->rx_buf_seg_size);
+	if (!skb)
+		return NULL;
 
 	skb_reserve(skb, pad);
 	skb_put(skb, len);
-- 
2.17.1