CVE-2022-50773

In the Linux kernel, the following vulnerability has been resolved:

ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt

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: 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 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 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.

Affected Software

References

• https://git.kernel.org/stable/c/0649129359219ce6ff380ec401f87308485c6ae3
• https://git.kernel.org/stable/c/06ec592389f2be3199779ab823c4323dcfd2121f
• https://git.kernel.org/stable/c/1a763c748acd5540ccc43306c57c9c6c5fb60884
• https://git.kernel.org/stable/c/250eed7b9994d79f9c409f954dbd08e88f5afd83
• https://git.kernel.org/stable/c/7e91667db38abb056da5a496d40fbd044c66bed2
• https://git.kernel.org/stable/c/b471fe61da523a15e4cb60fa81f5a2377e4bad98
• https://git.kernel.org/stable/c/c7e9624d90bf20f1eed6b228949396d614b94020
• https://git.kernel.org/stable/c/cba633b24a98d957e8190ef8bc4d4cdb4f6e9313
• https://git.kernel.org/stable/c/cf2ea3c86ad90d63d1c572b43e1ca9276b0357ad