tree cf319c7ccc74a68e0a959f172b966110572dcafe
parent fea1d0940301378206955264a01778700fc9c16f
author Liu Jian <liujian56@huawei.com> 1650106679 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1654496386 +0200

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>