@@ -553,6 +553,14 @@ static int mana_pre_alloc_rxbufs(struct mana_port_context *mpc, int new_mtu)
va = netdev_alloc_frag(mpc->rxbpre_alloc_size);
if (!va)
goto error;
+
+ page = virt_to_head_page(va);
+ /* Check if the frag falls back to single page */
+ if (compound_order(page) <
+ get_order(mpc->rxbpre_alloc_size)) {
+ put_page(page);
+ goto error;
+ }
} else {
page = dev_alloc_page();
if (!page)
@@ -1504,6 +1512,13 @@ static void *mana_get_rxfrag(struct mana_rxq *rxq, struct device *dev,
if (!va)
return NULL;
+
+ page = virt_to_head_page(va);
+ /* Check if the frag falls back to single page */
+ if (compound_order(page) < get_order(rxq->alloc_size)) {
+ put_page(page);
+ return NULL;
+ }
} else {
page = dev_alloc_page();
if (!page)
netdev/napi_alloc_frag() may fall back to single page which is smaller than the requested size. Add error checking to avoid memory overwritten. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> --- drivers/net/ethernet/microsoft/mana/mana_en.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)