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bpf: Set a dst for test runs of lwt_in progs

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When an lwt prog runs on a route, the skb always has a dst. To push an SRH,
bpf_lwt_push_encap() reads the device from this dst. But
bpf_prog_test_run_skb() sets a dst for lwt_xmit progs only. Thus the helper
dereferences a NULL dst in a test run of an lwt_in prog.

Set the same dst, ip6_null_entry, for lwt_in progs. When IPv6 is disabled
or not built, their test run now fails with -EOPNOTSUPP too. An lwt_out
prog cannot call this helper.

Fixes: fe94cc290f ("bpf: Add IPv6 Segment Routing helpers")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261101190535.1454146-18-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2026-11-01 19:05:25 +00:00
parent 58e39f8d58
commit c1ca06e48e
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1 changed files with 2 additions and 1 deletions
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3
net/bpf/test_run.c
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@ -1210,7 +1210,8 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
skb->ip_summed = CHECKSUM_COMPLETE;
}
if (prog->type == BPF_PROG_TYPE_LWT_XMIT) {
if (prog->type == BPF_PROG_TYPE_LWT_IN ||
prog->type == BPF_PROG_TYPE_LWT_XMIT) {
if (!ipv6_mod_enabled()) {
pr_warn_once("Please test this program with IPv6 enabled kernel\n");
ret = -EOPNOTSUPP;