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Message-ID: <00000000000086df45061dfcc91d@google.com>
Date: Wed, 24 Jul 2024 04:43:30 -0700
From: syzbot <syzbot+44623300f057a28baf1e@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [net?] [bpf?] general protection fault in __dev_flush
For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.
***
Subject: Re: [syzbot] [net?] [bpf?] general protection fault in __dev_flush
Author: aha310510@...il.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();
--
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