On Mon, Oct 28, 2019 at 02:13:20PM +0100, Takashi Iwai wrote:
On Mon, 28 Oct 2019 11:32:07 +0100, syzbot wrote:
Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 __msan_chain_origin+0x6b/0xd0 mm/kmsan/kmsan_instr.c:179 parse_term_proc_unit+0x73d/0x7e0 sound/usb/mixer.c:896 __check_input_term+0x13ef/0x2360 sound/usb/mixer.c:989
So this comes from the invalid descriptor for a processing unit, and it's very likely the same issue as already spotted -- the validator up to 5.3-rc4 had a bug that passed the invalid descriptor falsely. This should have been covered by 5.3-rc5, commit ba8bf0967a15 ("ALSA: usb-audio: Fix copy&paste error in the validator").
SHould we be backporting the validator to any older kernels as well?
thanks,
greg k-h