linux-kernel - [PATCH] i40e: Fix use of uninitialized variable

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Message-Id: <20200916204943.41017-1-alex.dewar90@gmail.com>
Date:   Wed, 16 Sep 2020 21:49:42 +0100
From:   Alex Dewar <alex.dewar90@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Alex Dewar <alex.dewar90@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] i40e: Fix use of uninitialized variable

In i40e_clean_rx_irq_zc(), the variable failure is only set when a
condition is met, but then its value is used unconditionally. Fix this.

Addresses-Coverity: 1496986 ("Uninitialized value")
Fixes: 8cbf74149903 ("i40e, xsk: move buffer allocation out of the Rx processing loop")
Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
---
 drivers/net/ethernet/intel/i40e/i40e_xsk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 6acede0acdca..18c05d23e15e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -364,8 +364,8 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 		napi_gro_receive(&rx_ring->q_vector->napi, skb);
 	}
 
-	if (cleaned_count >= I40E_RX_BUFFER_WRITE)
-		failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
+	failure = (cleaned_count >= I40E_RX_BUFFER_WRITE) &&
+		  !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
 
 	i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
 	i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
-- 
2.28.0