Re: [PATCH v2] net: remove an assert call in eth_get_gso_type

[Alexander Bulekov]

Also reported here in May: https://bugs.launchpad.net/qemu/+bug/1878067
-Alex

On 201020 1930, P J P wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
> 
> eth_get_gso_type() routine returns segmentation offload type based on
> L3 protocol type. It calls g_assert_not_reached if L3 protocol is
> unknown, making the following return statement unreachable. Remove the
> g_assert call, as it maybe triggered by a guest user.
> 
> Reported-by: Gaoning Pan <pgn@zju.edu.cn>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
> ---
>  net/eth.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> Update v2: add qemu_log()
>   -> https://lists.nongnu.org/archive/html/qemu-devel/2020-10/msg05576.html
> 
> diff --git a/net/eth.c b/net/eth.c
> index 0c1d413ee2..fd76e349eb 100644
> --- a/net/eth.c
> +++ b/net/eth.c
> @@ -16,6 +16,7 @@
>   */
> 
>  #include "qemu/osdep.h"
> +#include "qemu/log.h"
>  #include "net/eth.h"
>  #include "net/checksum.h"
>  #include "net/tap.h"
> @@ -71,9 +72,7 @@ eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, 
> uint8_t l4proto)
>              return VIRTIO_NET_HDR_GSO_TCPV6 | ecn_state;
>          }
>      }
> -
> -    /* Unsupported offload */
> -    g_assert_not_reached();
> +    qemu_log("Probably not GSO frame, unknown L3 protocol: %hd\n", l3_proto);
> 
>      return VIRTIO_NET_HDR_GSO_NONE | ecn_state;
>  }
> --
> 2.26.2
> 
>