target/linux/generic/backport-5.15/796-v6.5-01-usbnet-ipheth-fix-risk-of-NULL-pointer-deallocation.patch

   1 From 2203718c2f59ffdd6c78d54e5add594aebb4461e Mon Sep 17 00:00:00 2001
   2 From: Georgi Valkov <gvalkov@gmail.com>
   3 Date: Wed, 7 Jun 2023 15:56:59 +0200
   4 Subject: [PATCH 1/4] usbnet: ipheth: fix risk of NULL pointer deallocation
   5
   6 The cleanup precedure in ipheth_probe will attempt to free a
   7 NULL pointer in dev->ctrl_buf if the memory allocation for
   8 this buffer is not successful. While kfree ignores NULL pointers,
   9 and the existing code is safe, it is a better design to rearrange
  10 the goto labels and avoid this.
  11
  12 Signed-off-by: Georgi Valkov <gvalkov@gmail.com>
  13 Signed-off-by: Foster Snowhill <forst@pen.gy>
  14 Signed-off-by: David S. Miller <davem@davemloft.net>
  15 ---
  16  drivers/net/usb/ipheth.c | 2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/net/usb/ipheth.c
  20 +++ b/drivers/net/usb/ipheth.c
  21 @@ -510,8 +510,8 @@ err_register_netdev:
  22         ipheth_free_urbs(dev);
  23  err_alloc_urbs:
  24  err_get_macaddr:
  25 -err_alloc_ctrl_buf:
  26         kfree(dev->ctrl_buf);
  27 +err_alloc_ctrl_buf:
  28  err_endpoints:
  29         free_netdev(netdev);
  30         return retval;