drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c:951 otx2_get_fecparam() warn: always true condition '(pfvf->linfo.fec < 4) => (0-3 < 4)'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8baef6386baaefb776bdd09b5c7630cf057c51c6
commit: d0cf9503e908ee7b235a5efecedeb74aabc482f3 octeontx2-pf: ethtool fec mode support
date:   5 months ago
config: ia64-randconfig-m031-20210723 (attached as .config)
compiler: ia64-linux-gcc (GCC) 10.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

New smatch warnings:
drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c:951 otx2_get_fecparam() warn: always true condition '(pfvf->linfo.fec < 4) => (0-3 < 4)'

Old smatch warnings:
drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c:962 otx2_get_fecparam() error: buffer overflow 'fec' 4 <= 4

vim +951 drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c

   939	
   940	static int otx2_get_fecparam(struct net_device *netdev,
   941				     struct ethtool_fecparam *fecparam)
   942	{
   943		struct otx2_nic *pfvf = netdev_priv(netdev);
   944		struct cgx_fw_data *rsp;
   945		const int fec[] = {
   946			ETHTOOL_FEC_OFF,
   947			ETHTOOL_FEC_BASER,
   948			ETHTOOL_FEC_RS,
   949			ETHTOOL_FEC_BASER | ETHTOOL_FEC_RS};
   950	#define FEC_MAX_INDEX 4
 > 951		if (pfvf->linfo.fec < FEC_MAX_INDEX)
   952			fecparam->active_fec = fec[pfvf->linfo.fec];
   953	
   954		rsp = otx2_get_fwdata(pfvf);
   955		if (IS_ERR(rsp))
   956			return PTR_ERR(rsp);
   957	
   958		if (rsp->fwdata.supported_fec <= FEC_MAX_INDEX) {
   959			if (!rsp->fwdata.supported_fec)
   960				fecparam->fec = ETHTOOL_FEC_NONE;
   961			else
   962				fecparam->fec = fec[rsp->fwdata.supported_fec];
   963		}
   964		return 0;
   965	}
   966	

---
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