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Yue Haibing 9d31f0a915 atm: clip: Fix NULL pointer dereference in vcc_sendmsg() 
[ 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:
 <TASK>
 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: 1da177e4c3 ("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 <yuehaibing@huawei.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250705085228.329202-1-yuehaibing@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 07b585ae3699c0a5026f86ac846f144e34875eee)
 		2025-07-22 16:16:39 +08:00
..
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile
…
addr.c
…
addr.h
…
atm_misc.c
…
atm_sysfs.c driver core: make struct class.dev_uevent() take a const * 2022-11-24 17:12:15 +01:00
br2684.c net: atm: use address setting helpers 2021-10-24 13:59:45 +01:00
clip.c atm: clip: Fix NULL pointer dereference in vcc_sendmsg() 2025-07-22 16:16:39 +08:00
common.c atm: Revert atm_account_tx() if copy_from_iter_full() fails. 2025-07-03 11:32:08 +08:00
common.h net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
ioctl.c atm: Fix Use-After-Free in do_vcc_ioctl 2023-12-20 17:01:48 +01:00
lec.c net: atm: fix /proc/net/atm/lec handling 2025-07-03 11:32:11 +08:00
lec.h
…
lec_arpc.h net: atm: lec_arpc.h: delete duplicated word 2020-07-19 18:14:21 -07:00
mpc.c atm: Fix NULL pointer dereference 2025-04-14 15:41:17 +08:00
mpc.h
…
mpoa_caches.c mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
mpoa_caches.h
…
mpoa_proc.c net/atm: fix proc_mpc_write incorrect return value 2022-10-15 11:08:36 +01:00
pppoatm.c net: atm: pppoatm: use new API for wakeup tasklet 2021-01-29 18:24:05 -08:00
proc.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
protocols.h
…
pvc.c sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES) 2023-06-24 15:50:13 -07:00
raw.c atm: Revert atm_account_tx() if copy_from_iter_full() fails. 2025-07-03 11:32:08 +08:00
resources.c atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister(). 2025-07-09 09:50:01 +08:00
resources.h atm: lift copyin from atm_dev_ioctl() 2020-05-20 20:31:35 -04:00
signaling.c net: annotate lockless accesses to sk->sk_err_soft 2023-03-17 08:25:05 +00:00
signaling.h
…
svc.c sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES) 2023-06-24 15:50:13 -07:00