From: Kuniyuki Iwashima <kuni1840@gmail.com>
To: syzbot+1d3c235276f62963e93a@syzkaller.appspotmail.com
Cc: 3chas3@gmail.com, kuni1840@gmail.com, kuniyu@google.com,
linux-atm-general@lists.sourceforge.net,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [atm?] KMSAN: uninit-value in atmtcp_c_send
Date: Thu, 12 Jun 2025 20:00:38 -0700 [thread overview]
Message-ID: <20250613030043.226990-1-kuni1840@gmail.com> (raw)
In-Reply-To: <684b8f83.a00a0220.279073.0008.GAE@google.com>
From: syzbot <syzbot+1d3c235276f62963e93a@syzkaller.appspotmail.com>
Date: Thu, 12 Jun 2025 19:40:03 -0700
> Hello,
>
> syzbot tried to test the proposed patch but the build/boot failed:
>
> drivers/atm/atmtcp.c:293:24: error: use of undeclared identifier 'atmtcp_hdr'; did you mean 'atm_tcp_ops'?
Oops, I forgot struct :/
#syz test
diff --git a/drivers/atm/atmtcp.c b/drivers/atm/atmtcp.c
index d4aa0f353b6c..96c0969ce584 100644
--- a/drivers/atm/atmtcp.c
+++ b/drivers/atm/atmtcp.c
@@ -288,7 +288,11 @@ static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
struct sk_buff *new_skb;
int result = 0;
- if (!skb->len) return 0;
+ if (!skb->len)
+ return 0;
+ if (skb->len < sizeof(struct atmtcp_hdr))
+ return -EINVAL;
+
dev = vcc->dev_data;
hdr = (struct atmtcp_hdr *) skb->data;
if (hdr->length == ATMTCP_HDR_MAGIC) {
next prev parent reply other threads:[~2025-06-13 3:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-12 23:41 [syzbot] [atm?] KMSAN: uninit-value in atmtcp_c_send syzbot
2025-06-12 23:49 ` Kuniyuki Iwashima
2025-06-13 2:40 ` syzbot
2025-06-13 3:00 ` Kuniyuki Iwashima [this message]
2025-06-13 3:48 ` syzbot
2025-06-13 4:24 ` Kuniyuki Iwashima
2025-06-13 5:11 ` syzbot
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