diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 208e877d93d7..b809339f1776 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1911,6 +1911,14 @@ static int d40_validate_conf(struct d40_chan *d40c,
 		res = -EINVAL;
 	}
 
+	if (conf->use_fixed_channel &&
+	    (conf->phy_channel < 0 ||
+	     conf->phy_channel >= d40c->base->num_phy_chans)) {
+		chan_err(d40c, "Invalid physical channel (%d)\n",
+			 conf->phy_channel);
+		res = -EINVAL;
+	}
+
 	if (conf->dir == DMA_DEV_TO_DEV) {
 		/*
 		 * DMAC HW supports it. Will be added to this driver,