From: Jakub Kicinski Date: Fri, 1 Nov 2019 03:06:59 +0000 (-0700) Subject: net: cls_bpf: fix NULL deref on offload filter removal X-Git-Tag: v5.4-rc6~8^2^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=41aa29a58b5f7f7be43f35372ef411f304a87a0d;p=linux.git net: cls_bpf: fix NULL deref on offload filter removal Commit 401192113730 ("net: sched: refactor block offloads counter usage") missed the fact that either new prog or old prog may be NULL. Fixes: 401192113730 ("net: sched: refactor block offloads counter usage") Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller --- diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c index bf10bdaf5012..8229ed4a67be 100644 --- a/net/sched/cls_bpf.c +++ b/net/sched/cls_bpf.c @@ -162,16 +162,20 @@ static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, cls_bpf.name = obj->bpf_name; cls_bpf.exts_integrated = obj->exts_integrated; - if (oldprog) + if (oldprog && prog) err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf, skip_sw, &oldprog->gen_flags, &oldprog->in_hw_count, &prog->gen_flags, &prog->in_hw_count, true); - else + else if (prog) err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf, skip_sw, &prog->gen_flags, &prog->in_hw_count, true); + else + err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf, + skip_sw, &oldprog->gen_flags, + &oldprog->in_hw_count, true); if (prog && err) { cls_bpf_offload_cmd(tp, oldprog, prog, extack);