CVE-2022-48702

In the Linux kernel, the following vulnerability has been resolved: ALSA:
emu10k1: Fix out of bounds access in snd_emu10k1_pcm_channel_alloc() The
voice allocator sometimes begins allocating from near the end of the array
and then wraps around, however snd_emu10k1_pcm_channel_alloc() accesses the
newly allocated voices as if it never wrapped around. This results in out
of bounds access if the first voice has a high enough index so that
first_voice + requested_voice_count > NUM_G (64). The more voices are
requested, the more likely it is for this to occur. This was initially
discovered using PipeWire, however it can be reproduced by calling aplay
multiple times with 16 channels: aplay -r 48000 -D plughw:CARD=Live,DEV=3
-c 16 /dev/zero UBSAN: array-index-out-of-bounds in
sound/pci/emu10k1/emupcm.c:127:40 index 65 is out of range for type
‘snd_emu10k1_voice [64]’ CPU: 1 PID: 31977 Comm: aplay Tainted: G W IOE
6.0.0-rc2-emu10k1+ #7 Hardware name: ASUSTEK COMPUTER INC P5W DH Deluxe/P5W
DH Deluxe, BIOS 3002 07/22/2010 Call Trace: <TASK> dump_stack_lvl+0x49/0x63
dump_stack+0x10/0x16 ubsan_epilogue+0x9/0x3f
__ubsan_handle_out_of_bounds.cold+0x44/0x49
snd_emu10k1_playback_hw_params+0x3bc/0x420 [snd_emu10k1]
snd_pcm_hw_params+0x29f/0x600 [snd_pcm] snd_pcm_common_ioctl+0x188/0x1410
[snd_pcm] ? exit_to_user_mode_prepare+0x35/0x170 ? do_syscall_64+0x69/0x90
? syscall_exit_to_user_mode+0x26/0x50 ? do_syscall_64+0x69/0x90 ?
exit_to_user_mode_prepare+0x35/0x170 snd_pcm_ioctl+0x27/0x40 [snd_pcm]
__x64_sys_ioctl+0x95/0xd0 do_syscall_64+0x5c/0x90 ? do_syscall_64+0x69/0x90
? do_syscall_64+0x69/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd