linux-kernel - Re: [syzbot] [syzbot] [bpf?] [trace?] WARNING in format

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Message-ID: <000000000000ccbc6c060ab2aa42@google.com>
Date:   Tue, 21 Nov 2023 16:19:06 -0800
From:   syzbot <syzbot+e2c932aec5c8a6e1d31c@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [syzbot] [bpf?] [trace?] WARNING in format_decode (3)

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Subject: [syzbot] [bpf?] [trace?] WARNING in format_decode (3)
Author: eadavis@...com

please test unsupported %? in format string

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git 76df934c6d5f
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index c9fdcc5cdce1..78258a822a5c 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -845,6 +845,9 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
 {
 	struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
 
+	if (!skb->len)
+		return -EINVAL;
+
 	if (!__skb)
 		return 0;