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linux/drivers/media
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Edward Adam Davis 86307e443c media: vidtv: Fix a null-ptr-deref in vidtv_mux_stop_thread 
[ Upstream commit 1221989555 ]

syzbot report a null-ptr-deref in vidtv_mux_stop_thread. [1]

If dvb->mux is not initialized successfully by vidtv_mux_init() in the
vidtv_start_streaming(), it will trigger null pointer dereference about mux
in vidtv_mux_stop_thread().

Adjust the timing of streaming initialization and check it before
stopping it.

[1]
KASAN: null-ptr-deref in range [0x0000000000000128-0x000000000000012f]
CPU: 0 UID: 0 PID: 5842 Comm: syz-executor248 Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:vidtv_mux_stop_thread+0x26/0x80 drivers/media/test-drivers/vidtv/vidtv_mux.c:471
Code: 90 90 90 90 66 0f 1f 00 55 53 48 89 fb e8 82 2e c8 f9 48 8d bb 28 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 02 7e 3b 0f b6 ab 28 01 00 00 31 ff 89 ee e8
RSP: 0018:ffffc90003f2faa8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87cfb125
RDX: 0000000000000025 RSI: ffffffff87d120ce RDI: 0000000000000128
RBP: ffff888029b8d220 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: ffff888029b8d188
R13: ffffffff8f590aa0 R14: ffffc9000581c5c8 R15: ffff888029a17710
FS:  00007f7eef5156c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7eef5e635c CR3: 0000000076ca6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vidtv_stop_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:209 [inline]
 vidtv_stop_feed+0x151/0x250 drivers/media/test-drivers/vidtv/vidtv_bridge.c:252
 dmx_section_feed_stop_filtering+0x90/0x160 drivers/media/dvb-core/dvb_demux.c:1000
 dvb_dmxdev_feed_stop.isra.0+0x1ee/0x270 drivers/media/dvb-core/dmxdev.c:486
 dvb_dmxdev_filter_stop+0x22a/0x3a0 drivers/media/dvb-core/dmxdev.c:559
 dvb_dmxdev_filter_free drivers/media/dvb-core/dmxdev.c:840 [inline]
 dvb_demux_release+0x92/0x550 drivers/media/dvb-core/dmxdev.c:1246
 __fput+0x3f8/0xb60 fs/file_table.c:450
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 get_signal+0x1d3/0x2610 kernel/signal.c:2790
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported-by: syzbot+5e248227c80a3be8e96a@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=5e248227c80a3be8e96a
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-02-21 13:49:59 +01:00
..
cec media: pulse8-cec: fix data timestamp at pulse8_setup() 2024-11-14 13:15:14 +01:00
common media: v4l2-tpg: prevent the risk of a division by zero 2024-11-14 13:15:14 +01:00
dvb-core media: dvbdev: fix the logic when DVB_DYNAMIC_MINORS is not set 2024-11-22 15:37:32 +01:00
dvb-frontends media: cxd2841er: fix 64-bit division on gcc-9 2025-02-21 13:49:58 +01:00
firewire media: Makefiles: remove extra spaces 2022-03-12 16:59:52 +01:00
i2c media: ccs: Fix cleanup order in ccs_probe() 2025-02-21 13:49:49 +01:00
mc media: mc: mark the media devnode as registered from the, start 2024-06-16 13:41:35 +02:00
mmc media: media/*/Kconfig: sort entries 2022-03-18 05:58:35 +01:00
pci media: solo6x10: replace max(a, min(b, c)) by clamp(b, a, c) 2024-08-29 17:30:41 +02:00
platform media: imx-jpeg: Fix potential error pointer dereference in detach_pm() 2025-02-21 13:49:28 +01:00
radio media: wl128x: Fix atomicity violation in fmc_send_cmd() 2024-12-14 19:54:04 +01:00
rc media: rc: iguanair: handle timeouts 2025-02-21 13:49:17 +01:00
spi media updates for v5.18-rc1 2022-03-23 14:51:35 -07:00
test-drivers media: vidtv: Fix a null-ptr-deref in vidtv_mux_stop_thread 2025-02-21 13:49:59 +01:00
tuners Revert "media: tuners: fix error return code of hybrid_tuner_request_state()" 2024-10-17 15:21:16 +02:00
usb media: uvcvideo: Remove redundant NULL assignment 2025-02-21 13:49:49 +01:00
v4l2-core media: mc: fix endpoint iteration 2025-02-21 13:49:48 +01:00
Kconfig media: remove reference to CONFIG_EMBEDDED in MEDIA_SUPPORT_FILTER 2022-09-08 18:19:29 +02:00
Makefile media: Makefiles: remove extra spaces 2022-03-12 16:59:52 +01:00