Gaosheng Cui 1a763c748a ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt ... [ Upstream commit cf2ea3c86a ] I got a null-ptr-defer error report when I do the following tests on the qemu platform: make defconfig and CONFIG_PARPORT=m, CONFIG_PARPORT_PC=m, CONFIG_SND_MTS64=m Then making test scripts: cat>test_mod1.sh<<EOF modprobe snd-mts64 modprobe snd-mts64 EOF Executing the script, perhaps several times, we will get a null-ptr-defer report, as follow: syzkaller:~# ./test_mod.sh snd_mts64: probe of snd_mts64.0 failed with error -5 modprobe: ERROR: could not insert 'snd_mts64': No such device BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 0 PID: 205 Comm: modprobe Not tainted 6.1.0-rc8-00588-g76dcd734eca2 #6 Call Trace: <IRQ> snd_mts64_interrupt+0x24/0xa0 [snd_mts64] parport_irq_handler+0x37/0x50 [parport] __handle_irq_event_percpu+0x39/0x190 handle_irq_event_percpu+0xa/0x30 handle_irq_event+0x2f/0x50 handle_edge_irq+0x99/0x1b0 __common_interrupt+0x5d/0x100 common_interrupt+0xa0/0xc0 </IRQ> <TASK> asm_common_interrupt+0x22/0x40 RIP: 0010:_raw_write_unlock_irqrestore+0x11/0x30 parport_claim+0xbd/0x230 [parport] snd_mts64_probe+0x14a/0x465 [snd_mts64] platform_probe+0x3f/0xa0 really_probe+0x129/0x2c0 __driver_probe_device+0x6d/0xc0 driver_probe_device+0x1a/0xa0 __device_attach_driver+0x7a/0xb0 bus_for_each_drv+0x62/0xb0 __device_attach+0xe4/0x180 bus_probe_device+0x82/0xa0 device_add+0x550/0x920 platform_device_add+0x106/0x220 snd_mts64_attach+0x2e/0x80 [snd_mts64] port_check+0x14/0x20 [parport] bus_for_each_dev+0x6e/0xc0 __parport_register_driver+0x7c/0xb0 [parport] snd_mts64_module_init+0x31/0x1000 [snd_mts64] do_one_initcall+0x3c/0x1f0 do_init_module+0x46/0x1c6 load_module+0x1d8d/0x1e10 __do_sys_finit_module+0xa2/0xf0 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Kernel panic - not syncing: Fatal exception in interrupt Rebooting in 1 seconds.. The mts wa not initialized during interrupt, we add check for mts to fix this bug. Fixes: 68ab801e32 ("[ALSA] Add snd-mts64 driver for ESI Miditerminal 4140") Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com> Link: https://lore.kernel.org/r/20221206061004.1222966-1-cuigaosheng1@huawei.com Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-12-31 13:26:09 +01:00
..
ac97	ALSA: ac97: Replace sprintf() with sysfs_emit()	2022-08-02 16:03:41 +02:00
aoa	ALSA: aoa: Fix I2S device accounting	2022-11-04 00:00:33 +09:00
arm	ALSA: arm: pxa: pxa2xx-ac97-lib: fix return value check of platform_get_irq()	2022-11-16 10:03:51 +01:00
atmel	…
core	ALSA: pcm: Set missing stop_operating flag at undoing trigger start	2022-12-31 13:26:09 +01:00
drivers	ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt	2022-12-31 13:26:09 +01:00
firewire	ALSA: dice: fix regression for Lexicon I-ONIX FW810S	2022-12-08 11:30:18 +01:00
hda	ASoC: hda: intel-dsp-config: add ES83x6 quirk for IceLake	2022-12-02 17:43:14 +01:00
i2c	…
isa	ALSA: wavefront: remove redundant assignment to pointer end	2022-07-04 14:29:27 +02:00
mips	…
oss	…
parisc	…
pci	ALSA: asihpi: fix missing pci_disable_device()	2022-12-31 13:26:05 +01:00
pcmcia	…
ppc	…
sh	…
soc	ASoC: pcm512x: Fix PM disable depth imbalance in pcm512x_probe	2022-12-31 13:26:06 +01:00
sparc	…
spi	sound:spi: remove reference to AVR32 in Atmel AT73C213 DAC driver	2022-08-03 11:11:26 +02:00
synth	ALSA: Use del_timer_sync() before freeing timer	2022-11-04 00:00:17 +09:00
usb	ALSA: usb-audio: add quirk to fix Hamedal C20 disconnect issue	2022-12-02 17:43:01 +01:00
virtio	…
x86	ALSA: x86: intel_hdmi_audio: use pm_runtime_resume_and_get()	2022-06-17 10:46:38 +02:00
xen	xen/sndfront: use xenbus_setup_ring() and xenbus_teardown_ring()	2022-05-19 14:22:08 +02:00
Kconfig	…
Makefile	…
ac97_bus.c	…
last.c	…
sound_core.c	…