[PATCH] ALSA: asihpi: Fix potential OOB array access

[Takashi Iwai <tiwai@xxxxxxx>]

ASIHPI driver stores some values in the static array upon a response
from the driver, and its index depends on the firmware.  We shouldn't
trust it blindly.

This patch adds a sanity check of the array index to fit in the array
size.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/pci/asihpi/hpimsgx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/asihpi/hpimsgx.c b/sound/pci/asihpi/hpimsgx.c
index d0caef299481..b68e6bfbbfba 100644
--- a/sound/pci/asihpi/hpimsgx.c
+++ b/sound/pci/asihpi/hpimsgx.c
@@ -708,7 +708,7 @@ static u16 HPIMSGX__init(struct hpi_message *phm,
 		phr->error = HPI_ERROR_PROCESSING_MESSAGE;
 		return phr->error;
 	}
-	if (hr.error == 0) {
+	if (hr.error == 0 && hr.u.s.adapter_index < HPI_MAX_ADAPTERS) {
 		/* the adapter was created successfully
 		   save the mapping for future use */
 		hpi_entry_points[hr.u.s.adapter_index] = entry_point_func;
-- 
2.43.0