From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1720C2E3AE5; Tue, 15 Jul 2025 13:46:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752587214; cv=none; b=UCcYDNGQ8slbnSKQYtpm/HX9fXy1m4kBnGJSy1KmdMxG9NS7YzTRpwbboEUcXwjru36UDMWg2uKXBv6TfoXB2yJxUxPqKMMBnqL6LcY6snhUxFcLZQF31cdLdXE7rvtXlJFpcqs2FB8DjKtplAf6Q4/2oNkOxGemDOgtvQbDadA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752587214; c=relaxed/simple; bh=ZcDa9bhuQUKz/lrGhPdD+u7wy1uEI8w53qqkzcDq+i8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OZSQXC5FMb/H/24vh7NPaEe/Ns8qX+I3x5O3xsCxGibySDpQ8DGHEzfI9PbqcpTqZraYn5CLoC9vbZ3NdWGn7lj2DfGAVF+TFubNhFsbjRfMiGVD1ubfKiSkVxHOvYcTCSJQUU8VZ4jueqRIVTnhIQjDGHhI9beusbX/EPg5QBo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0HhxicEh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0HhxicEh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B44CC4CEE3; Tue, 15 Jul 2025 13:46:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1752587213; bh=ZcDa9bhuQUKz/lrGhPdD+u7wy1uEI8w53qqkzcDq+i8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0HhxicEhSItw1HK+7+TLe03LvKhxljy/p4fVhjCc6aTXi8T04fwE3OV8+Co5fe1nm iX0C6uF5cn3Xa+ZKsFYyJqsrxxaDNU9eg7oLDQ7oNwuLB+5zjQCru47VKPh4tde7Fm qroHANIpxJKFvn5Ym37twmjpGmepVXVW2+VEIpdI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+e34e5e6b5eddb0014def@syzkaller.appspotmail.com, Yue Haibing , Kuniyuki Iwashima , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.1 17/88] atm: clip: Fix NULL pointer dereference in vcc_sendmsg() Date: Tue, 15 Jul 2025 15:13:53 +0200 Message-ID: <20250715130755.203377703@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250715130754.497128560@linuxfoundation.org> References: <20250715130754.497128560@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yue Haibing [ Upstream commit 22fc46cea91df3dce140a7dc6847c6fcf0354505 ] atmarpd_dev_ops does not implement the send method, which may cause crash as bellow. BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 0 P4D 0 Oops: Oops: 0010 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc9000d3cf778 EFLAGS: 00010246 RAX: 1ffffffff1910dd1 RBX: 00000000000000c0 RCX: dffffc0000000000 RDX: ffffc9000dc82000 RSI: ffff88803e4c4640 RDI: ffff888052cd0000 RBP: ffffc9000d3cf8d0 R08: ffff888052c9143f R09: 1ffff1100a592287 R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff92001a79f00 R13: ffff888052cd0000 R14: ffff88803e4c4640 R15: ffffffff8c886e88 FS: 00007fbc762566c0(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000041f1b000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vcc_sendmsg+0xa10/0xc50 net/atm/common.c:644 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x52d/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmmsg+0x227/0x430 net/socket.c:2709 __do_sys_sendmmsg net/socket.c:2736 [inline] __se_sys_sendmmsg net/socket.c:2733 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2733 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzbot+e34e5e6b5eddb0014def@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/682f82d5.a70a0220.1765ec.0143.GAE@google.com/T Signed-off-by: Yue Haibing Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250705085228.329202-1-yuehaibing@huawei.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/atm/clip.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/net/atm/clip.c b/net/atm/clip.c index 936b9558be4b9..53d62361ae460 100644 --- a/net/atm/clip.c +++ b/net/atm/clip.c @@ -632,8 +632,16 @@ static void atmarpd_close(struct atm_vcc *vcc) module_put(THIS_MODULE); } +static int atmarpd_send(struct atm_vcc *vcc, struct sk_buff *skb) +{ + atm_return_tx(vcc, skb); + dev_kfree_skb_any(skb); + return 0; +} + static const struct atmdev_ops atmarpd_dev_ops = { - .close = atmarpd_close + .close = atmarpd_close, + .send = atmarpd_send }; -- 2.39.5