4.4-stable review patch. If anyone has any objections, please let me know.
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From: hayeswang hayeswang@realtek.com
[ Upstream commit 98d068ab52b4b11d403995ed14154660797e7136 ]
The list rx_done would be initialized when the linking on occurs. Therefore, if a napi is scheduled without any linking on before, the following kernel panic would happen.
BUG: unable to handle kernel NULL pointer dereference at 000000000000008 IP: [<ffffffffc085efde>] r8152_poll+0xe1e/0x1210 [r8152] PGD 0 Oops: 0002 [#1] SMP
Signed-off-by: Hayes Wang hayeswang@realtek.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/usb/r8152.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -1277,6 +1277,7 @@ static int alloc_all_mem(struct r8152 *t spin_lock_init(&tp->rx_lock); spin_lock_init(&tp->tx_lock); INIT_LIST_HEAD(&tp->tx_free); + INIT_LIST_HEAD(&tp->rx_done); skb_queue_head_init(&tp->tx_queue); skb_queue_head_init(&tp->rx_queue);