linux-kernel - Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in skb_release_head

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Date: Wed,  1 May 2024 16:48:53 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+d863bc2d28ef7ff42984@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in skb_release_head_state

On Tue, 30 Apr 2024 21:19:20 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    50dffbf77180 Merge tag 'for-v6.9-rc' of git://git.kernel.o..
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10ba57bb180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  50dffbf77180

--- l/net/bluetooth/hci_request.c
+++ y/net/bluetooth/hci_request.c
@@ -181,7 +181,6 @@ int __hci_req_sync(struct hci_dev *hdev,
 		break;
 	}
 
-	kfree_skb(hdev->req_skb);
 	hdev->req_skb = NULL;
 	hdev->req_status = hdev->req_result = 0;
 
--