Currently, verifier function add_subprog() returns 0 for success
and negative value for failure. Change the return value
to be the subprog number for success. This functionality will be
used in the next patch to save a call to find_subprog().
Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
kernel/bpf/verifier.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 3fc5d1b28b6c..dd860ce1f591 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1530,7 +1530,7 @@ static int add_subprog(struct bpf_verifier_env *env, int off)
}
ret = find_subprog(env, off);
if (ret >= 0)
- return 0;
+ return ret;
if (env->subprog_cnt >= BPF_MAX_SUBPROGS) {
verbose(env, "too many subprograms\n");
return -E2BIG;
@@ -1538,7 +1538,7 @@ static int add_subprog(struct bpf_verifier_env *env, int off)
env->subprog_info[env->subprog_cnt++].start = off;
sort(env->subprog_info, env->subprog_cnt,
sizeof(env->subprog_info[0]), cmp_subprogs, NULL);
- return 0;
+ return env->subprog_cnt - 1;
}
static int check_subprogs(struct bpf_verifier_env *env)
--
2.24.1
