Re: net/can/isotp.c:1240:13: sparse: sparse: incorrect type in initializer (different address spaces)

From: Marc Kleine-Budde
Date: Thu Oct 29 2020 - 03:34:26 EST

Hello,

looks like sh is missing the some __user annotations so that sparse spwes these
warnings. Adding sh maintainers to Cc.

regards,
Marc

On 10/29/20 12:01 AM, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 23859ae44402f4d935b9ee548135dd1e65e2cbf4
> commit: e057dd3fc20ffb3d7f150af46542a51b59b90127 can: add ISO 15765-2:2016 transport protocol
> date: 3 weeks ago
> config: sh-randconfig-s031-20201028 (attached as .config)
> compiler: sh4-linux-gcc (GCC) 9.3.0
> 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: v0.6.3-56-gc09e8239-dirty
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e057dd3fc20ffb3d7f150af46542a51b59b90127
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout e057dd3fc20ffb3d7f150af46542a51b59b90127
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=sh
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
>
> "sparse warnings: (new ones prefixed by >>)"
>>> net/can/isotp.c:1240:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected int const *__gu_addr @@ got int [noderef] __user *optlen @@
>>> net/can/isotp.c:1240:13: sparse: expected int const *__gu_addr
>>> net/can/isotp.c:1240:13: sparse: got int [noderef] __user *optlen
>>> net/can/isotp.c:1240:13: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __user *ptr @@ got int const *__gu_addr @@
>>> net/can/isotp.c:1240:13: sparse: expected void const volatile [noderef] __user *ptr
>>> net/can/isotp.c:1240:13: sparse: got int const *__gu_addr
>
> vim +1240 net/can/isotp.c
>
> 1229
> 1230 static int isotp_getsockopt(struct socket *sock, int level, int optname,
> 1231 char __user *optval, int __user *optlen)
> 1232 {
> 1233 struct sock *sk = sock->sk;
> 1234 struct isotp_sock *so = isotp_sk(sk);
> 1235 int len;
> 1236 void *val;
> 1237
> 1238 if (level != SOL_CAN_ISOTP)
> 1239 return -EINVAL;
>> 1240 if (get_user(len, optlen))
> 1241 return -EFAULT;
> 1242 if (len < 0)
> 1243 return -EINVAL;
> 1244
> 1245 switch (optname) {
> 1246 case CAN_ISOTP_OPTS:
> 1247 len = min_t(int, len, sizeof(struct can_isotp_options));
> 1248 val = &so->opt;
> 1249 break;
> 1250
> 1251 case CAN_ISOTP_RECV_FC:
> 1252 len = min_t(int, len, sizeof(struct can_isotp_fc_options));
> 1253 val = &so->rxfc;
> 1254 break;
> 1255
> 1256 case CAN_ISOTP_TX_STMIN:
> 1257 len = min_t(int, len, sizeof(u32));
> 1258 val = &so->force_tx_stmin;
> 1259 break;
> 1260
> 1261 case CAN_ISOTP_RX_STMIN:
> 1262 len = min_t(int, len, sizeof(u32));
> 1263 val = &so->force_rx_stmin;
> 1264 break;
> 1265
> 1266 case CAN_ISOTP_LL_OPTS:
> 1267 len = min_t(int, len, sizeof(struct can_isotp_ll_options));
> 1268 val = &so->ll;
> 1269 break;
> 1270
> 1271 default:
> 1272 return -ENOPROTOOPT;
> 1273 }
> 1274
> 1275 if (put_user(len, optlen))
> 1276 return -EFAULT;
> 1277 if (copy_to_user(optval, val, len))
> 1278 return -EFAULT;
> 1279 return 0;
> 1280 }
> 1281
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
>


--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |

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