[PATCH] net: lan966x: fix page_pool error handling in lan966x_fdma_rx_alloc_page_pool()

[David Carlier <devnexen@gmail.com>]

page_pool_create() can return an ERR_PTR on failure. The return value
is used unconditionally in the loop that follows, passing the error
pointer through xdp_rxq_info_reg_mem_model() into page_pool_use_xdp_mem(),
which dereferences it, causing a kernel oops.

Add an IS_ERR check after page_pool_create() to return early on failure.

Fixes: 11871aba1974 ("net: lan96x: Use page_pool API")
Cc: stable@vger.kernel.org
Signed-off-by: David Carlier <devnexen@gmail.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
index 7b6369e43451..34bbcae2f068 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
@@ -92,6 +92,9 @@ static int lan966x_fdma_rx_alloc_page_pool(struct lan966x_rx *rx)
 
 	rx->page_pool = page_pool_create(&pp_params);
 
+	if (unlikely(IS_ERR(rx->page_pool)))
+		return PTR_ERR(rx->page_pool);
+
 	for (int i = 0; i < lan966x->num_phys_ports; ++i) {
 		struct lan966x_port *port;
 
-- 
2.53.0