[PATCH bpf-next 2/2] bpf: Check link_create parameter for multi_uprobe

[Tao Chen]

The target_fd and flags in link_create no used in multi_uprobe
, return -EINVAL if they assigned, keep it same as other link
attach apis.

Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Signed-off-by: Tao Chen <chen.dylane@xxxxxxxxx>
---
 kernel/trace/bpf_trace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 2f206a2a2..f7ebf17e3 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3385,6 +3385,9 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 	if (sizeof(u64) != sizeof(void *))
 		return -EOPNOTSUPP;
 
+	if (attr->link_create.target_fd || attr->link_create.flags)
+		return -EINVAL;
+
 	if (!is_uprobe_multi(prog))
 		return -EINVAL;
 
-- 
2.43.0