[PATCH V2 3/4] mailbox: zynqmp-ipi: Fix out-of-bounds access in mailbox cleanup loop

[Harini T <harini.t@amd.com>]

The cleanup loop was starting at the wrong array index, causing
out-of-bounds access.
Start the loop at the correct index for zero-indexed arrays to prevent
accessing memory beyond the allocated array bounds.

Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
Signed-off-by: Harini T <harini.t@amd.com>
---
 drivers/mailbox/zynqmp-ipi-mailbox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
index bdcc6937ee30..dddbef6b2cb8 100644
--- a/drivers/mailbox/zynqmp-ipi-mailbox.c
+++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
@@ -890,7 +890,7 @@ static void zynqmp_ipi_free_mboxes(struct zynqmp_ipi_pdata *pdata)
 	if (pdata->irq < MAX_SGI)
 		xlnx_mbox_cleanup_sgi(pdata);
 
-	i = pdata->num_mboxes;
+	i = pdata->num_mboxes - 1;
 	for (; i >= 0; i--) {
 		ipi_mbox = &pdata->ipi_mboxes[i];
 		if (device_is_registered(&ipi_mbox->dev))
-- 
2.43.0