net: libwx: handle page_pool_dev_alloc_pages error

page_pool_dev_alloc_pages could return NULL. There was a WARN_ON(!page)
but it would still proceed to use the NULL pointer and then crash.

This is similar to commit 001ba09
("net: fec: handle page_pool_dev_alloc_pages error").

This is found by our static analysis tool KNighter.

Signed-off-by: Chenyuan Yang <[email protected]>
Fixes: 3c47e8a ("net: libwx: Support to receive packets in NAPI")
Reviewed-by: Joe Damato <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: WhiteFox-Project

drivers/net/ethernet/wangxun/libwx/wx_lib.c

@@ -310,7 +310,8 @@ static bool wx_alloc_mapped_page(struct wx_ring *rx_ring,
 		return true;
 
 	page = page_pool_dev_alloc_pages(rx_ring->page_pool);
-	WARN_ON(!page);
+	if (unlikely(!page))
+		return false;
 	dma = page_pool_get_dma_addr(page);
 
 	bi->page_dma = dma;