[PATCH v2] accel/ivpu: Fix signed integer truncation in IPC receive

[Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>]

Fix potential buffer overflow where firmware-supplied data_size is cast
to signed int before being used in min_t(). Large unsigned values
(>= 0x80000000) become negative, causing unsigned wraparound and
oversized memcpy operations that can overflow the stack buffer.

Change min_t(int, ...) to min() as both values are unsigned and can be
handled by min() without explicit cast.

Fixes: 3b434a3445ff ("accel/ivpu: Use threaded IRQ to handle JOB done messages")
Cc: <stable@vger.kernel.org> # v6.12+
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
---
Changes in v2:
- Replaced min_t() with min()

 drivers/accel/ivpu/ivpu_ipc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
index f47df092bb0d..9347f05a2b79 100644
--- a/drivers/accel/ivpu/ivpu_ipc.c
+++ b/drivers/accel/ivpu/ivpu_ipc.c
@@ -276,7 +276,7 @@ int ivpu_ipc_receive(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
 	if (ipc_buf)
 		memcpy(ipc_buf, rx_msg->ipc_hdr, sizeof(*ipc_buf));
 	if (rx_msg->jsm_msg) {
-		u32 size = min_t(int, rx_msg->ipc_hdr->data_size, sizeof(*jsm_msg));
+		u32 size = min(rx_msg->ipc_hdr->data_size, sizeof(*jsm_msg));
 
 		if (rx_msg->jsm_msg->result != VPU_JSM_STATUS_SUCCESS) {
 			ivpu_err(vdev, "IPC resp result error: %d\n", rx_msg->jsm_msg->result);
-- 
2.43.0