From: Arnaud Lecomte <contact@arnaud-lcm.com>
To: syzbot+29fc8991b0ecb186cf40@syzkaller.appspotmail.com
Cc: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, linux-kernel@vger.kernel.org,
linux-ppp@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot]
Date: Mon, 7 Apr 2025 16:17:47 +0200 [thread overview]
Message-ID: <20250407141747.92874-1-contact@arnaud-lcm.com> (raw)
In-Reply-To: <67ae3912.050a0220.21dd3.0021.GAE@google.com>
Author: contact@arnaud-lcm.com
#syz test
diff --git a/drivers/net/ppp/ppp_synctty.c b/drivers/net/ppp/ppp_synctty.c
index 644e99fc3623..520d895acc60 100644
--- a/drivers/net/ppp/ppp_synctty.c
+++ b/drivers/net/ppp/ppp_synctty.c
@@ -506,6 +506,11 @@ ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *skb)
unsigned char *data;
int islcp;
+ /* Ensure we can safely access protocol field and LCP code */
+ if (!skb || !pskb_may_pull(skb, 3)) {
+ kfree_skb(skb);
+ return NULL;
+ }
data = skb->data;
proto = get_unaligned_be16(data);
next prev parent reply other threads:[~2025-04-07 14:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-13 18:25 [syzbot] [ppp?] KMSAN: uninit-value in ppp_sync_send (2) syzbot
2025-04-07 14:06 ` [syzbot] Arnaud Lecomte
2025-04-07 14:26 ` [syzbot] [ppp?] KMSAN: uninit-value in ppp_sync_send (2) syzbot
2025-04-07 14:17 ` [syzbot] Arnaud Lecomte
2025-04-07 14:17 ` [syzbot] syzbot
2025-04-07 14:17 ` Arnaud Lecomte [this message]
2025-04-07 14:54 ` [syzbot] [ppp?] KMSAN: uninit-value in ppp_sync_send (2) syzbot
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