The data length of skb frags + frag_list may be greater than 0xffff, and skb_header_pointer can not handle negative offset and negative len. So here INT_MAX is used to check the validity of offset and len. And add the test case for the change. Liu Jian (2): net: Enlarge offset check value from 0xffff to INT_MAX in bpf_skb_load_bytes selftests: bpf: add test for skb_load_bytes net/core/filter.c | 4 +- .../selftests/bpf/prog_tests/skb_load_bytes.c | 65 +++++++++++++++++++ .../selftests/bpf/progs/skb_load_bytes.c | 37 +++++++++++ 3 files changed, 104 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/skb_load_bytes.c create mode 100644 tools/testing/selftests/bpf/progs/skb_load_bytes.c -- 2.17.1