linux-kernel - Re: [syzbot] [PATCH] test aea6bf908d73

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Message-ID: <000000000000b3a5370609c67cfe@google.com>
Date:   Thu, 09 Nov 2023 22:32:40 -0800
From:   syzbot <syzbot+bbe84a4010eeea00982d@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] test aea6bf908d73

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***

Subject: [PATCH] test aea6bf908d73
Author: lizhi.xu@...driver.com

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git aea6bf908d73

diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
index e2680a3bef79..6ba43a0369d3 100644
--- a/net/nfc/llcp_commands.c
+++ b/net/nfc/llcp_commands.c
@@ -738,7 +738,7 @@ int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
 
 	pr_debug("Send UI frame len %zd\n", len);
 
-	local = sock->local;
+	local = nfc_llcp_find_local(sock->dev);
 	if (local == NULL)
 		return -ENODEV;
 
diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
index 1dac28136e6a..150d0e24e27c 100644
--- a/net/nfc/llcp_core.c
+++ b/net/nfc/llcp_core.c
@@ -284,6 +284,7 @@ struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 	spin_lock(&llcp_devices_lock);
 	list_for_each_entry(local, &llcp_devices, list)
 		if (local->dev == dev) {
+			printk("finded: %p, d: %p, %s\n", local, dev, __func__);
 			res = nfc_llcp_local_get(local);
 			break;
 		}
@@ -299,6 +300,7 @@ static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
 	spin_lock(&llcp_devices_lock);
 	list_for_each_entry_safe(local, tmp, &llcp_devices, list)
 		if (local->dev == dev) {
+			printk("deled: l: %p, d: %p, %s\n", local, dev, __func__);
 			list_del(&local->list);
 			spin_unlock(&llcp_devices_lock);
 			return local;