target/linux/lantiq/patches-5.10/0719-v6.0-net-lantiq_xrx200-restore-buffer-if-memory-allocatio.patch

   1 From c9c3b1775f80fa21f5bff874027d2ccb10f5d90c Mon Sep 17 00:00:00 2001
   2 From: Aleksander Jan Bajkowski <olek2@wp.pl>
   3 Date: Wed, 24 Aug 2022 23:54:08 +0200
   4 Subject: [PATCH] net: lantiq_xrx200: restore buffer if memory allocation
   5  failed
   6
   7 In a situation where memory allocation fails, an invalid buffer address
   8 is stored. When this descriptor is used again, the system panics in the
   9 build_skb() function when accessing memory.
  10
  11 Fixes: 7ea6cd16f159 ("lantiq: net: fix duplicated skb in rx descriptor ring")
  12 Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
  13 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  14 ---
  15  drivers/net/ethernet/lantiq_xrx200.c | 1 +
  16  1 file changed, 1 insertion(+)
  17
  18 --- a/drivers/net/ethernet/lantiq_xrx200.c
  19 +++ b/drivers/net/ethernet/lantiq_xrx200.c
  20 @@ -193,6 +193,7 @@ static int xrx200_alloc_buf(struct xrx20
  21
  22         ch->rx_buff[ch->dma.desc] = alloc(priv->rx_skb_size);
  23         if (!ch->rx_buff[ch->dma.desc]) {
  24 +               ch->rx_buff[ch->dma.desc] = buf;
  25                 ret = -ENOMEM;
  26                 goto skip;
  27         }