tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   61c3426aca2c71052ddcd06c32e29d92304990fd
commit: c247897d7c194e6fb4a7c8314af2226bec017a59 [2619/4832] netfilter: nft_payload: access GRE payload via inner offset
config: sparc-randconfig-s041-20221102
compiler: sparc-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=c247897d7c194e6fb4a7c8314af2226bec017a59
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout c247897d7c194e6fb4a7c8314af2226bec017a59
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc SHELL=/bin/bash net/netfilter/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

sparse warnings: (new ones prefixed by >>)
   net/netfilter/nft_payload.c: note: in included file (through include/net/sctp/sctp.h, include/net/sctp/checksum.h):
   include/net/sctp/structs.h:335:41: sparse: sparse: array of flexible structures
>> net/netfilter/nft_payload.c:112:25: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [usertype] version @@     got restricted __be16 @@
   net/netfilter/nft_payload.c:112:25: sparse:     expected unsigned int [usertype] version
   net/netfilter/nft_payload.c:112:25: sparse:     got restricted __be16
>> net/netfilter/nft_payload.c:114:22: sparse: sparse: restricted __be16 degrades to integer

vim +112 net/netfilter/nft_payload.c

    82	
    83	static int __nft_payload_inner_offset(struct nft_pktinfo *pkt)
    84	{
    85		unsigned int thoff = nft_thoff(pkt);
    86	
    87		if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff)
    88			return -1;
    89	
    90		switch (pkt->tprot) {
    91		case IPPROTO_UDP:
    92			pkt->inneroff = thoff + sizeof(struct udphdr);
    93			break;
    94		case IPPROTO_TCP: {
    95			struct tcphdr *th, _tcph;
    96	
    97			th = skb_header_pointer(pkt->skb, thoff, sizeof(_tcph), &_tcph);
    98			if (!th)
    99				return -1;
   100	
   101			pkt->inneroff = thoff + __tcp_hdrlen(th);
   102			}
   103			break;
   104		case IPPROTO_GRE: {
   105			u32 offset = sizeof(struct gre_base_hdr), version;
   106			struct gre_base_hdr *gre, _gre;
   107	
   108			gre = skb_header_pointer(pkt->skb, thoff, sizeof(_gre), &_gre);
   109			if (!gre)
   110				return -1;
   111	
 > 112			version = gre->flags & GRE_VERSION;
   113			switch (version) {
 > 114			case GRE_VERSION_0:
   115				if (gre->flags & GRE_ROUTING)
   116					return -1;
   117	
   118				if (gre->flags & GRE_CSUM) {
   119					offset += sizeof_field(struct gre_full_hdr, csum) +
   120						  sizeof_field(struct gre_full_hdr, reserved1);
   121				}
   122				if (gre->flags & GRE_KEY)
   123					offset += sizeof_field(struct gre_full_hdr, key);
   124	
   125				if (gre->flags & GRE_SEQ)
   126					offset += sizeof_field(struct gre_full_hdr, seq);
   127				break;
   128			default:
   129				return -1;
   130			}
   131	
   132			pkt->inneroff = thoff + offset;
   133			}
   134			break;
   135		default:
   136			return -1;
   137		}
   138	
   139		pkt->flags |= NFT_PKTINFO_INNER;
   140	
   141		return 0;
   142	}
   143	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp