linux-kernel - Re: [syzbot] [bpf?] [net?] general protection fault in dev_map

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Date: Mon, 08 Apr 2024 17:30:36 +0200
From: Toke Høiland-Jørgensen <toke@...nel.org>
To: syzbot <syzbot+af9492708df9797198d6@...kaller.appspotmail.com>,
 andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
 daniel@...earbox.net, davem@...emloft.net, eadavis@...com,
 eddyz87@...il.com, haoluo@...gle.com, hawk@...nel.org,
 john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org,
 kuba@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev,
 netdev@...r.kernel.org, sdf@...gle.com, song@...nel.org,
 syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] [net?] general protection fault in dev_map_enqueue

syzbot <syzbot+af9492708df9797198d6@...kaller.appspotmail.com> writes:

> Hello,
>
> syzbot tried to test the proposed patch but the build/boot failed:

Trying again on a different branch:

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git 443574b03387


diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index dfd919374017..a3f24486829e 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -281,9 +281,9 @@ static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
 static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog,
                              u32 repeat)
 {
-       struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
        int err = 0, act, ret, i, nframes = 0, batch_sz;
        struct xdp_frame **frames = xdp->frames;
+       struct bpf_redirect_info *ri;
        struct xdp_page_head *head;
        struct xdp_frame *frm;
        bool redirect = false;
@@ -294,6 +294,7 @@ static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog
*prog,
 
        local_bh_disable();
        xdp_set_return_frame_no_direct();
+       ri = this_cpu_ptr(&bpf_redirect_info);
 
        for (i = 0; i < batch_sz; i++) {
                page = page_pool_dev_alloc_pages(xdp->pp);