With CONFIG_CFI_CLANG enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. As bpf_kfree_skb() signature differs from the btf_dtor_kfunc_t pointer type used for the destructor calls in bpf_obj_free_fields(), add a stub function with the correct type to fix the type mismatch. Signed-off-by: Sami Tolvanen --- net/sched/bpf_qdisc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/sched/bpf_qdisc.c b/net/sched/bpf_qdisc.c index adcb618a2bfc..4558f5c01ed5 100644 --- a/net/sched/bpf_qdisc.c +++ b/net/sched/bpf_qdisc.c @@ -202,6 +202,11 @@ __bpf_kfunc void bpf_kfree_skb(struct sk_buff *skb) kfree_skb(skb); } +__bpf_kfunc void __bpf_kfree_skb(void *skb) +{ + bpf_kfree_skb(skb); +} + /* bpf_qdisc_skb_drop - Drop an skb by adding it to a deferred free list. * @skb: The skb whose reference to be released and dropped. * @to_free_list: The list of skbs to be dropped. @@ -449,7 +454,7 @@ static struct bpf_struct_ops bpf_Qdisc_ops = { .owner = THIS_MODULE, }; -BTF_ID_LIST_SINGLE(bpf_sk_buff_dtor_ids, func, bpf_kfree_skb) +BTF_ID_LIST_SINGLE(bpf_sk_buff_dtor_ids, func, __bpf_kfree_skb) static int __init bpf_qdisc_kfunc_init(void) { -- 2.50.1.470.g6ba607880d-goog