CVE-2022-49975

In the Linux kernel, the following vulnerability has been resolved: bpf: Don't redirect packets with invalid pkt_len Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any skbs, that is, the flow->head is null. The root cause, as the [2] says, is because that bpf_prog_test_run_skb() run a bpf prog which redirects empty skbs. So we should determine whether the length of the packet modified by bpf prog or others like bpf_prog_test is valid before forwarding it directly.

• linux linux kernel (< 5.4.212) • linux linux kernel (>= 5.5 < 5.10.141) • linux linux kernel (>= 5.11 < 5.15.65) • linux linux kernel (>= 5.16 < 5.19.7)