diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index ea656e011a96..41765172297c 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -479,6 +479,12 @@ void ath10k_pci_write32(struct ath10k *ar, u32 offset, u32 value)
 	struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
 	int ret;
 
+	if (unlikely(offset + sizeof(value) > ar_pci->mem_len)) {
+		ath10k_warn(ar, "refusing to write mmio out of bounds at 0x%08x - 0x%08zx (max 0x%08zx)\n",
+			    offset, offset + sizeof(value), ar_pci->mem_len);
+		return;
+	}
+
 	ret = ath10k_pci_wake(ar);
 	if (ret) {
 		ath10k_warn(ar, "failed to wake target for write32 of 0x%08x at 0x%08x: %d\n",
@@ -496,6 +502,12 @@ u32 ath10k_pci_read32(struct ath10k *ar, u32 offset)
 	u32 val;
 	int ret;
 
+	if (unlikely(offset + sizeof(val) > ar_pci->mem_len)) {
+		ath10k_warn(ar, "refusing to read mmio out of bounds at 0x%08x - 0x%08zx (max 0x%08zx)\n",
+			    offset, offset + sizeof(val), ar_pci->mem_len);
+		return 0;
+	}
+
 	ret = ath10k_pci_wake(ar);
 	if (ret) {
 		ath10k_warn(ar, "failed to wake target for read32 at 0x%08x: %d\n",
@@ -2679,6 +2691,7 @@ static int ath10k_pci_claim(struct ath10k *ar)
 	pci_set_master(pdev);
 
 	/* Arrange for access to Target SoC registers. */
+	ar_pci->mem_len = pci_resource_len(pdev, BAR_NUM);
 	ar_pci->mem = pci_iomap(pdev, BAR_NUM, 0);
 	if (!ar_pci->mem) {
 		ath10k_err(ar, "failed to iomap BAR%d\n", BAR_NUM);
diff --git a/drivers/net/wireless/ath/ath10k/pci.h b/drivers/net/wireless/ath/ath10k/pci.h
index d7696ddc03c4..eea0a0170b00 100644
--- a/drivers/net/wireless/ath/ath10k/pci.h
+++ b/drivers/net/wireless/ath/ath10k/pci.h
@@ -162,6 +162,7 @@ struct ath10k_pci {
 	struct device *dev;
 	struct ath10k *ar;
 	void __iomem *mem;
+	size_t mem_len;
 
 	/*
 	 * Number of MSI interrupts granted, 0 --> using legacy PCI line