[PATCH bpf-next 1/4] bpf: Use __GFP_NOWARN for kvcalloc when attaching multiple uprobes

[Hou Tao <houtao@xxxxxxxxxxxxxxx>]

From: Hou Tao <houtao1@xxxxxxxxxx>

An abnormally big cnt may be passed to link_create.uprobe_multi.cnt,
and it will trigger the following warning in kvmalloc_node():

	if (unlikely(size > INT_MAX)) {
		WARN_ON_ONCE(!(flags & __GFP_NOWARN));
		return NULL;
	}

Fix the warning by using __GFP_NOWARN when invoking kvzalloc() in
bpf_uprobe_multi_link_attach().

Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Reported-by: xingwei lee <xrivendell7@xxxxxxxxx>
Closes: https://lore.kernel.org/bpf/CABOYnLwwJY=yFAGie59LFsUsBAgHfroVqbzZ5edAXbFE3YiNVA@xxxxxxxxxxxxxx
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
 kernel/trace/bpf_trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 774cf476a892..07b9b5896d6c 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3378,7 +3378,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 	err = -ENOMEM;
 
 	link = kzalloc(sizeof(*link), GFP_KERNEL);
-	uprobes = kvcalloc(cnt, sizeof(*uprobes), GFP_KERNEL);
+	uprobes = kvcalloc(cnt, sizeof(*uprobes), GFP_KERNEL | __GFP_NOWARN);
 
 	if (!uprobes || !link)
 		goto error_free;
-- 
2.29.2