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Wed, 24 Jul 2024 04:43:30 -0700 (PDT) Date: Wed, 24 Jul 2024 04:43:30 -0700 In-Reply-To: <0000000000009d1d0a061d91b803@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000086df45061dfcc91d@google.com> Subject: Re: [syzbot] Re: [syzbot] [net?] [bpf?] general protection fault in __dev_flush From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [net?] [bpf?] general protection fault in __dev_flush Author: aha310510@gmail.com #syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master --- drivers/net/tun.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 9b24861464bc..9254bca2813d 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1661,7 +1661,6 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, int len, int *skb_xdp) { struct page_frag *alloc_frag = ¤t->task_frag; - struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; struct bpf_prog *xdp_prog; int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); char *buf; @@ -1701,7 +1700,6 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, local_bh_disable(); rcu_read_lock(); - bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx); xdp_prog = rcu_dereference(tun->xdp_prog); if (xdp_prog) { struct xdp_buff xdp; @@ -1730,14 +1728,12 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, pad = xdp.data - xdp.data_hard_start; len = xdp.data_end - xdp.data; } - bpf_net_ctx_clear(bpf_net_ctx); rcu_read_unlock(); local_bh_enable(); return __tun_build_skb(tfile, alloc_frag, buf, buflen, len, pad); out: - bpf_net_ctx_clear(bpf_net_ctx); rcu_read_unlock(); local_bh_enable(); return NULL; @@ -2570,7 +2566,6 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) if (m->msg_controllen == sizeof(struct tun_msg_ctl) && ctl && ctl->type == TUN_MSG_PTR) { - struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx; struct tun_page tpage; int n = ctl->num; int flush = 0, queued = 0; @@ -2579,7 +2574,6 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) local_bh_disable(); rcu_read_lock(); - bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx); for (i = 0; i < n; i++) { xdp = &((struct xdp_buff *)ctl->ptr)[i]; @@ -2594,7 +2588,6 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) if (tfile->napi_enabled && queued > 0) napi_schedule(&tfile->napi); - bpf_net_ctx_clear(bpf_net_ctx); rcu_read_unlock(); local_bh_enable(); --