From: Daniil Dementev d.dementev@ispras.ru

[ Upstream commit 3ddbe35d9a2ebd4924d458e0246b4ba6c13bb456 ]

Buffer overflow could occur in the loop "while", due to accessing an array element before checking the index.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Daniil Dementev d.dementev@ispras.ru Reviewed-by: Alexey Khoroshilov khoroshilov@ispras.ru Link: https://lore.kernel.org/r/20220610165732.2904-1-d.dementev@ispras.ru Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- sound/usb/mixer_us16x08.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/usb/mixer_us16x08.c b/sound/usb/mixer_us16x08.c index bd63a9ce6a70..71f6186edcdd 100644 --- a/sound/usb/mixer_us16x08.c +++ b/sound/usb/mixer_us16x08.c @@ -637,10 +637,10 @@ static int snd_get_meter_comp_index(struct snd_us16x08_meter_store *store) } } else { /* skip channels with no compressor active */ - while (!store->comp_store->val[ + while (store->comp_index <= SND_US16X08_MAX_CHANNELS + && !store->comp_store->val[ COMP_STORE_IDX(SND_US16X08_ID_COMP_SWITCH)] - [store->comp_index - 1] - && store->comp_index <= SND_US16X08_MAX_CHANNELS) { + [store->comp_index - 1]) { store->comp_index++; } ret = store->comp_index++;