diff mbox series

bpf: fix range_tree_set error handling

Message ID 20250106231536.52856-1-soma.nakata@somane.sakura.ne.jp (mailing list archive)
State New
Delegated to: BPF
Headers show
Series bpf: fix range_tree_set error handling | expand

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Commit Message

Soma Nakata Jan. 6, 2025, 11:15 p.m. UTC 
`range_tree_set` might fail and return -ENOMEM,
causing subsequent `bpf_arena_alloc_pages` to fail.
Added the error handling.

Signed-off-by: Soma Nakata <soma.nakata@somane.sakura.ne.jp>
---
 kernel/bpf/arena.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

Hou Tao Jan. 7, 2025, 6:15 a.m. UTC | #1 
On 1/7/2025 7:15 AM, Soma Nakata wrote:
> `range_tree_set` might fail and return -ENOMEM,
> causing subsequent `bpf_arena_alloc_pages` to fail.
> Added the error handling.
>
> Signed-off-by: Soma Nakata <soma.nakata@somane.sakura.ne.jp>
> ---
>  kernel/bpf/arena.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c
> index 41a76ca56040..4b22a651b5d5 100644
> --- a/kernel/bpf/arena.c
> +++ b/kernel/bpf/arena.c
> @@ -138,7 +138,11 @@ static struct bpf_map *arena_map_alloc(union bpf_attr *attr)
>  	INIT_LIST_HEAD(&arena->vma_list);
>  	bpf_map_init_from_attr(&arena->map, attr);
>  	range_tree_init(&arena->rt);
> -	range_tree_set(&arena->rt, 0, attr->max_entries);
> +	err = range_tree_set(&arena->rt, 0, attr->max_entries);
> +	if (err) {
> +		bpf_map_area_free(arena);
> +		goto err;
> +	}
>  	mutex_init(&arena->lock);
>  
>  	return &arena->map;

The fix is straightforward, so

Acked-by: Hou Tao <houtao1@huawei.com>
diff mbox series

Patch

diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c
index 41a76ca56040..4b22a651b5d5 100644
--- a/kernel/bpf/arena.c
+++ b/kernel/bpf/arena.c
@@ -138,7 +138,11 @@  static struct bpf_map *arena_map_alloc(union bpf_attr *attr)
 	INIT_LIST_HEAD(&arena->vma_list);
 	bpf_map_init_from_attr(&arena->map, attr);
 	range_tree_init(&arena->rt);
-	range_tree_set(&arena->rt, 0, attr->max_entries);
+	err = range_tree_set(&arena->rt, 0, attr->max_entries);
+	if (err) {
+		bpf_map_area_free(arena);
+		goto err;
+	}
 	mutex_init(&arena->lock);
 
 	return &arena->map;