diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 7d4cc28ca365..586a5f1fba0f 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -1099,6 +1099,9 @@ static int t4_flash_erase_sectors(struct adapter *adapter, int start, int end)
 {
 	int ret = 0;
 
+	if (end >= adapter->params.sf_nsec)
+		return -EINVAL;
+
 	while (start <= end) {
 		if ((ret = sf1_write(adapter, 1, 0, 1, SF_WR_ENABLE)) != 0 ||
 		    (ret = sf1_write(adapter, 4, 0, 1,