From: Liu Jian <liujian56@huawei.com>
Date: Sat, 16 Apr 2022 10:57:59 +0000 (+0800)
Subject: bpf: Enlarge offset check value to INT_MAX in bpf_skb_{load,store}_bytes
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=77f8c4a5f3d0c6f1adefb44f1f8aa02de73eac2c;p=linux.git

bpf: Enlarge offset check value to INT_MAX in bpf_skb_{load,store}_bytes

commit 45969b4152c1752089351cd6836a42a566d49bcf upstream.

The data length of skb frags + frag_list may be greater than 0xffff, and
skb_header_pointer can not handle negative offset. So, here INT_MAX is used
to check the validity of offset. Add the same change to the related function
skb_store_bytes.

Fixes: 05c74e5e53f6 ("bpf: add bpf_skb_load_bytes helper")
Signed-off-by: Liu Jian <liujian56@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220416105801.88708-2-liujian56@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/core/filter.c b/net/core/filter.c
index 821278b906b71..707e2e48d7691 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1688,7 +1688,7 @@ BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
 
 	if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
 		return -EINVAL;
-	if (unlikely(offset > 0xffff))
+	if (unlikely(offset > INT_MAX))
 		return -EFAULT;
 	if (unlikely(bpf_try_make_writable(skb, offset + len)))
 		return -EFAULT;
@@ -1723,7 +1723,7 @@ BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
 {
 	void *ptr;
 
-	if (unlikely(offset > 0xffff))
+	if (unlikely(offset > INT_MAX))
 		goto err_clear;
 
 	ptr = skb_header_pointer(skb, offset, len, to);