Hi Lv, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on block/for-next] [also build test WARNING on linux/master linus/master v5.12-rc5 next-20210401] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Lv-Yunlong/drbd-Fix-a-use-after-free-in-get_initial_state/20210402-015401 base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next config: x86_64-randconfig-s021-20210401 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-279-g6d5d9b42-dirty # https://github.com/0day-ci/linux/commit/af3f55d6c8730c5c1ce31fda165712091584adb0 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Lv-Yunlong/drbd-Fix-a-use-after-free-in-get_initial_state/20210402-015401 git checkout af3f55d6c8730c5c1ce31fda165712091584adb0 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> drivers/block/drbd/drbd_nl.c:4957:1: sparse: sparse: unused label 'out' drivers/block/drbd/drbd_nl.c: note: in included file: include/linux/genl_magic_func.h:212:12: sparse: sparse: symbol 'drbd_genl_cmd_to_str' was not declared. Should it be static? drivers/block/drbd/drbd_nl.c:454:33: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:454:33: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:454:33: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:691:38: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:691:38: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:691:38: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:793:40: sparse: sparse: mixing different enum types: drivers/block/drbd/drbd_nl.c:793:40: sparse: int enum drbd_state_rv drivers/block/drbd/drbd_nl.c:793:40: sparse: unsigned int enum drbd_ret_code drivers/block/drbd/drbd_nl.c:795:40: sparse: sparse: mixing different enum types: drivers/block/drbd/drbd_nl.c:795:40: sparse: int enum drbd_state_rv drivers/block/drbd/drbd_nl.c:795:40: sparse: unsigned int enum drbd_ret_code drivers/block/drbd/drbd_nl.c:980:18: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:980:18: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:980:18: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:1287:41: sparse: sparse: cast to restricted __be32 drivers/block/drbd/drbd_nl.c:1287:41: sparse: sparse: cast to restricted __be32 drivers/block/drbd/drbd_nl.c:1287:41: sparse: sparse: cast to restricted __be32 drivers/block/drbd/drbd_nl.c:1287:41: sparse: sparse: cast to restricted __be32 drivers/block/drbd/drbd_nl.c:1287:41: sparse: sparse: cast to restricted __be32 drivers/block/drbd/drbd_nl.c:1287:41: sparse: sparse: cast to restricted __be32 drivers/block/drbd/drbd_nl.c:1347:22: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:1347:22: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:1347:22: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:1639:17: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:1639:17: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:1639:17: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:1649:17: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:1649:17: sparse: struct fifo_buffer [noderef] __rcu * drivers/block/drbd/drbd_nl.c:1649:17: sparse: struct fifo_buffer * drivers/block/drbd/drbd_nl.c:1872:14: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:1872:14: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:1872:14: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:2130:39: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2130:39: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2130:39: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:2138:13: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2138:13: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2138:13: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:2320:50: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2320:50: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2320:50: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:2343:45: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2343:45: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2343:45: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:2488:9: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2488:9: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2488:9: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:2651:9: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2651:9: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2651:9: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:2803:27: sparse: sparse: mixing different enum types: drivers/block/drbd/drbd_nl.c:2883:18: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2883:18: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2883:18: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:2923:17: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:2923:17: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:2923:17: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:3461:33: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:3461:33: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:3461:33: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:3586:28: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:3586:28: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:3586:28: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:3799:29: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:3799:29: sparse: struct disk_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:3799:29: sparse: struct disk_conf * drivers/block/drbd/drbd_nl.c:3805:22: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:3805:22: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:3805:22: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:3995:38: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_nl.c:3995:38: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_nl.c:3995:38: sparse: struct net_conf * drivers/block/drbd/drbd_nl.c:450:9: sparse: sparse: context imbalance in 'highest_fencing_policy' - different lock contexts for basic block drivers/block/drbd/drbd_nl.c:2185:9: sparse: sparse: context imbalance in 'drbd_adm_attach' - different lock contexts for basic block drivers/block/drbd/drbd_nl.c: note: in included file: drivers/block/drbd/drbd_int.h:2141:14: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_int.h:2141:14: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_int.h:2141:14: sparse: struct net_conf * drivers/block/drbd/drbd_int.h:780:24: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf * drivers/block/drbd/drbd_int.h:780:24: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf * drivers/block/drbd/drbd_int.h:780:24: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf * drivers/block/drbd/drbd_int.h:780:24: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf * drivers/block/drbd/drbd_int.h:780:24: sparse: sparse: incompatible types in comparison expression (different address spaces): drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf [noderef] __rcu * drivers/block/drbd/drbd_int.h:780:24: sparse: struct net_conf * vim +/out +4957 drivers/block/drbd/drbd_nl.c a29728463b254c Andreas Gruenbacher 2014-07-31 4902 a29728463b254c Andreas Gruenbacher 2014-07-31 4903 static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb) a29728463b254c Andreas Gruenbacher 2014-07-31 4904 { a29728463b254c Andreas Gruenbacher 2014-07-31 4905 struct drbd_state_change *state_change = (struct drbd_state_change *)cb->args[0]; a29728463b254c Andreas Gruenbacher 2014-07-31 4906 unsigned int seq = cb->args[2]; a29728463b254c Andreas Gruenbacher 2014-07-31 4907 unsigned int n; af3f55d6c8730c Lv Yunlong 2021-04-01 4908 unsigned int skb_len = skb->len; a29728463b254c Andreas Gruenbacher 2014-07-31 4909 enum drbd_notification_type flags = 0; a29728463b254c Andreas Gruenbacher 2014-07-31 4910 a29728463b254c Andreas Gruenbacher 2014-07-31 4911 /* There is no need for taking notification_mutex here: it doesn't a29728463b254c Andreas Gruenbacher 2014-07-31 4912 matter if the initial state events mix with later state chage a29728463b254c Andreas Gruenbacher 2014-07-31 4913 events; we can always tell the events apart by the NOTIFY_EXISTS a29728463b254c Andreas Gruenbacher 2014-07-31 4914 flag. */ a29728463b254c Andreas Gruenbacher 2014-07-31 4915 a29728463b254c Andreas Gruenbacher 2014-07-31 4916 cb->args[5]--; a29728463b254c Andreas Gruenbacher 2014-07-31 4917 if (cb->args[5] == 1) { a29728463b254c Andreas Gruenbacher 2014-07-31 4918 notify_initial_state_done(skb, seq); af3f55d6c8730c Lv Yunlong 2021-04-01 4919 return skb_len; a29728463b254c Andreas Gruenbacher 2014-07-31 4920 } a29728463b254c Andreas Gruenbacher 2014-07-31 4921 n = cb->args[4]++; a29728463b254c Andreas Gruenbacher 2014-07-31 4922 if (cb->args[4] < cb->args[3]) a29728463b254c Andreas Gruenbacher 2014-07-31 4923 flags |= NOTIFY_CONTINUES; a29728463b254c Andreas Gruenbacher 2014-07-31 4924 if (n < 1) { a29728463b254c Andreas Gruenbacher 2014-07-31 4925 notify_resource_state_change(skb, seq, state_change->resource, a29728463b254c Andreas Gruenbacher 2014-07-31 4926 NOTIFY_EXISTS | flags); a29728463b254c Andreas Gruenbacher 2014-07-31 4927 goto next; a29728463b254c Andreas Gruenbacher 2014-07-31 4928 } a29728463b254c Andreas Gruenbacher 2014-07-31 4929 n--; a29728463b254c Andreas Gruenbacher 2014-07-31 4930 if (n < state_change->n_connections) { a29728463b254c Andreas Gruenbacher 2014-07-31 4931 notify_connection_state_change(skb, seq, &state_change->connections[n], a29728463b254c Andreas Gruenbacher 2014-07-31 4932 NOTIFY_EXISTS | flags); a29728463b254c Andreas Gruenbacher 2014-07-31 4933 goto next; a29728463b254c Andreas Gruenbacher 2014-07-31 4934 } a29728463b254c Andreas Gruenbacher 2014-07-31 4935 n -= state_change->n_connections; a29728463b254c Andreas Gruenbacher 2014-07-31 4936 if (n < state_change->n_devices) { a29728463b254c Andreas Gruenbacher 2014-07-31 4937 notify_device_state_change(skb, seq, &state_change->devices[n], a29728463b254c Andreas Gruenbacher 2014-07-31 4938 NOTIFY_EXISTS | flags); a29728463b254c Andreas Gruenbacher 2014-07-31 4939 goto next; a29728463b254c Andreas Gruenbacher 2014-07-31 4940 } a29728463b254c Andreas Gruenbacher 2014-07-31 4941 n -= state_change->n_devices; a29728463b254c Andreas Gruenbacher 2014-07-31 4942 if (n < state_change->n_devices * state_change->n_connections) { a29728463b254c Andreas Gruenbacher 2014-07-31 4943 notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n], a29728463b254c Andreas Gruenbacher 2014-07-31 4944 NOTIFY_EXISTS | flags); a29728463b254c Andreas Gruenbacher 2014-07-31 4945 goto next; a29728463b254c Andreas Gruenbacher 2014-07-31 4946 } a29728463b254c Andreas Gruenbacher 2014-07-31 4947 a29728463b254c Andreas Gruenbacher 2014-07-31 4948 next: a29728463b254c Andreas Gruenbacher 2014-07-31 4949 if (cb->args[4] == cb->args[3]) { a29728463b254c Andreas Gruenbacher 2014-07-31 4950 struct drbd_state_change *next_state_change = a29728463b254c Andreas Gruenbacher 2014-07-31 4951 list_entry(state_change->list.next, a29728463b254c Andreas Gruenbacher 2014-07-31 4952 struct drbd_state_change, list); a29728463b254c Andreas Gruenbacher 2014-07-31 4953 cb->args[0] = (long)next_state_change; a29728463b254c Andreas Gruenbacher 2014-07-31 4954 cb->args[3] = notifications_for_state_change(next_state_change); a29728463b254c Andreas Gruenbacher 2014-07-31 4955 cb->args[4] = 0; a29728463b254c Andreas Gruenbacher 2014-07-31 4956 } a29728463b254c Andreas Gruenbacher 2014-07-31 @4957 out: a29728463b254c Andreas Gruenbacher 2014-07-31 4958 return skb->len; a29728463b254c Andreas Gruenbacher 2014-07-31 4959 } a29728463b254c Andreas Gruenbacher 2014-07-31 4960 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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