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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id o21-20020a05620a2a1500b006b5cdbbfccfsm5742503qkp.79.2022.07.16.14.46.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 Jul 2022 14:46:58 -0700 (PDT) From: Tom Rix To: nbd@nbd.name, john@phrozen.org, sean.wang@mediatek.com, Mark-MC.Lee@mediatek.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, matthias.bgg@gmail.com Cc: netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Tom Rix Subject: [PATCH] net: ethernet: mtk_eth_soc: fix off by one check of ARRAY_SIZE Date: Sat, 16 Jul 2022 17:46:54 -0400 Message-Id: <20220716214654.1540240-1-trix@redhat.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In mtk_wed_tx_ring_setup(.., int idx, ..), idx is used as an index here struct mtk_wed_ring *ring =3D &dev->tx_ring[idx]; The bounds of idx are checked here BUG_ON(idx > ARRAY_SIZE(dev->tx_ring)); If idx is the size of the array, it will pass this check and overflow. So change the check to >=3D . Fixes: 804775dfc288 ("net: ethernet: mtk_eth_soc: add support for Wireless = Ethernet Dispatch (WED)") Signed-off-by: Tom Rix --- drivers/net/ethernet/mediatek/mtk_wed.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet= /mediatek/mtk_wed.c index 8f0cd3196aac..29be2fcafea3 100644 --- a/drivers/net/ethernet/mediatek/mtk_wed.c +++ b/drivers/net/ethernet/mediatek/mtk_wed.c @@ -651,7 +651,7 @@ mtk_wed_tx_ring_setup(struct mtk_wed_device *dev, int i= dx, void __iomem *regs) * WDMA RX. */ =20 - BUG_ON(idx > ARRAY_SIZE(dev->tx_ring)); + BUG_ON(idx >=3D ARRAY_SIZE(dev->tx_ring)); =20 if (mtk_wed_ring_alloc(dev, ring, MTK_WED_TX_RING_SIZE)) return -ENOMEM; --=20 2.27.0