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[73.222.201.58]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-32161282b5esm15905398a91.27.2025.08.11.16.37.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Aug 2025 16:37:16 -0700 (PDT) Date: Mon, 11 Aug 2025 16:37:14 -0700 From: Joe Damato To: Chandra Mohan Sundar Cc: sgoutham@marvell.com, lcherian@marvell.com, gakula@marvell.com, jerinj@marvell.com, hkelam@marvell.com, sbhatta@marvell.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, shuah@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev Subject: Re: [PATCH net] Octeontx2-af: Fix negative array index read warning Message-ID: Mail-Followup-To: Joe Damato , Chandra Mohan Sundar , sgoutham@marvell.com, lcherian@marvell.com, gakula@marvell.com, jerinj@marvell.com, hkelam@marvell.com, sbhatta@marvell.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, shuah@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev References: <20250810180339.228231-1-chandramohan.explore@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250810180339.228231-1-chandramohan.explore@gmail.com> On Sun, Aug 10, 2025 at 11:33:27PM +0530, Chandra Mohan Sundar wrote: > The cgx_get_cgxid function may return a negative value. > Using this value directly as an array index triggers Coverity warnings. > > Validate the returned value and handle the case gracefully. > > Signed-off-by: Chandra Mohan Sundar > --- > drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c > index 8375f18c8e07..b14de93a2481 100644 > --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c > +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c > @@ -3005,6 +3005,8 @@ static int cgx_print_fwdata(struct seq_file *s, int lmac_id) > return -EAGAIN; > > cgx_id = cgx_get_cgxid(cgxd); > + if (cgx_id < 0) > + return -EINVAL; > > if (rvu->hw->lmac_per_cgx == CGX_LMACS_USX) > fwdata = &rvu->fwdata->cgx_fw_data_usx[cgx_id][lmac_id]; A couple pieces of feedback for you: 1. Since this is a fixes it needs a Fixes tag and a commit SHA that it is fixing. 2. cgx_get_cgxid is called in 3 places, so your patch would probably need to be expanded to fix all uses? Overall though, did you somehow trigger this issue? It seems like all cases where cgx_get_cgxid is used it would be extremely difficult (maybe impossible?) for cgxd to be NULL and for it to return a negative value.