CC: kbuild-all(a)lists.01.org TO: Andrii Nakryiko <andriin(a)fb.com&gt; CC: Daniel Borkmann <daniel(a)iogearbox.net&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: aab2003999e78bbf2058dae1e661c44ede1d9766 commit: 517bbe1994a3cee29a35c730662277bb5daff582 [4349/4685] bpf: Enforce BPF ringbuf size to be the power of 2 :::::: branch date: 11 hours ago :::::: commit date: 26 hours ago config: i386-randconfig-m021-20200701 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: kernel/bpf/ringbuf.c:185 ringbuf_map_alloc() warn: passing a valid pointer to 'PTR_ERR' # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git remote update linux-next git checkout 517bbe1994a3cee29a35c730662277bb5daff582 vim +/PTR_ERR +185 kernel/bpf/ringbuf.c 517bbe1994a3ce Andrii Nakryiko 2020-06-29 169 457f44363a8894 Andrii Nakryiko 2020-05-29 170 rb_map = kzalloc(sizeof(*rb_map), GFP_USER); 457f44363a8894 Andrii Nakryiko 2020-05-29 171 if (!rb_map) 457f44363a8894 Andrii Nakryiko 2020-05-29 172 return ERR_PTR(-ENOMEM); 457f44363a8894 Andrii Nakryiko 2020-05-29 173 457f44363a8894 Andrii Nakryiko 2020-05-29 174 bpf_map_init_from_attr(&rb_map->map, attr); 457f44363a8894 Andrii Nakryiko 2020-05-29 175 457f44363a8894 Andrii Nakryiko 2020-05-29 176 cost = sizeof(struct bpf_ringbuf_map) + 457f44363a8894 Andrii Nakryiko 2020-05-29 177 sizeof(struct bpf_ringbuf) + 457f44363a8894 Andrii Nakryiko 2020-05-29 178 attr->max_entries; 457f44363a8894 Andrii Nakryiko 2020-05-29 179 err = bpf_map_charge_init(&rb_map->map.memory, cost); 457f44363a8894 Andrii Nakryiko 2020-05-29 180 if (err) 457f44363a8894 Andrii Nakryiko 2020-05-29 181 goto err_free_map; 457f44363a8894 Andrii Nakryiko 2020-05-29 182 457f44363a8894 Andrii Nakryiko 2020-05-29 183 rb_map->rb = bpf_ringbuf_alloc(attr->max_entries, rb_map->map.numa_node); 457f44363a8894 Andrii Nakryiko 2020-05-29 184 if (IS_ERR(rb_map->rb)) { 457f44363a8894 Andrii Nakryiko 2020-05-29 @185 err = PTR_ERR(rb_map->rb); 457f44363a8894 Andrii Nakryiko 2020-05-29 186 goto err_uncharge; 457f44363a8894 Andrii Nakryiko 2020-05-29 187 } 457f44363a8894 Andrii Nakryiko 2020-05-29 188 457f44363a8894 Andrii Nakryiko 2020-05-29 189 return &rb_map->map; 457f44363a8894 Andrii Nakryiko 2020-05-29 190 457f44363a8894 Andrii Nakryiko 2020-05-29 191 err_uncharge: 457f44363a8894 Andrii Nakryiko 2020-05-29 192 bpf_map_charge_finish(&rb_map->map.memory); 457f44363a8894 Andrii Nakryiko 2020-05-29 193 err_free_map: 457f44363a8894 Andrii Nakryiko 2020-05-29 194 kfree(rb_map); 457f44363a8894 Andrii Nakryiko 2020-05-29 195 return ERR_PTR(err); 457f44363a8894 Andrii Nakryiko 2020-05-29 196 } 457f44363a8894 Andrii Nakryiko 2020-05-29 197 :::::: The code at line 185 was first introduced by commit :::::: 457f44363a8894135c85b7a9afd2bd8196db24ab bpf: Implement BPF ring buffer and verifier support for it :::::: TO: Andrii Nakryiko <andriin(a)fb.com&gt; :::::: CC: Alexei Starovoitov <ast(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org