diff options
Diffstat (limited to '')
| -rw-r--r-- | net/bpf/test_run.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index 25001913d03b..fa2644d276ef 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -75,8 +75,18 @@ static int bpf_test_finish(const union bpf_attr *kattr, { void __user *data_out = u64_to_user_ptr(kattr->test.data_out); int err = -EFAULT; + u32 copy_size = size; + + /* Clamp copy if the user has provided a size hint, but copy the full + * buffer if not to retain old behaviour. + */ + if (kattr->test.data_size_out && + copy_size > kattr->test.data_size_out) { + copy_size = kattr->test.data_size_out; + err = -ENOSPC; + } - if (data_out && copy_to_user(data_out, data, size)) + if (data_out && copy_to_user(data_out, data, copy_size)) goto out; if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size))) goto out; @@ -84,7 +94,8 @@ static int bpf_test_finish(const union bpf_attr *kattr, goto out; if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration))) goto out; - err = 0; + if (err != -ENOSPC) + err = 0; out: return err; } |