bpf: Suppress 'passing zero to PTR_ERR' warning

Kernel Test Robot complains about passing zero to PTR_ERR for the said
line, suppress it by using PTR_ERR_OR_ZERO.

Fixes: c0a5a21c25f3 ("bpf: Allow storing referenced kptr in map")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220521132620.1976921-1-memxor@gmail.com

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 14e8c17..45153cb 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5352,7 +5352,7 @@ static int process_kptr_func(struct bpf_verifier_env *env, int regno,
                return -EINVAL;
        }
        if (!map_value_has_kptrs(map_ptr)) {
-               ret = PTR_ERR(map_ptr->kptr_off_tab);
+               ret = PTR_ERR_OR_ZERO(map_ptr->kptr_off_tab);
                if (ret == -E2BIG)
                        verbose(env, "map '%s' has more than %d kptr\n", map_ptr->name,
                                BPF_MAP_VALUE_OFF_MAX);