[Intel-wired-lan] [PATCH iwl-net v2] igc: fix potential skb leak in igc_fpe_xmit_smd_frame()

[Dahan, AvigailX]

On 15/04/2026 5:52, Kohei Enju wrote:
> When igc_fpe_init_tx_descriptor() fails, no one takes care of an
> allocated skb, leaking it. [1]
> Use dev_kfree_skb_any() on failure.
> 
> Tested on an I226 adapter with the following command, while injecting
> faults in igc_fpe_init_tx_descriptor() to trigger the error path.
>   # ethtool --set-mm $DEV verify-enabled on tx-enabled on pmac-enabled on
> 
> [1]
> unreferenced object 0xffff888113c6cdc0 (size 224):
> ...
>    backtrace (crc be3d3fda):
>      kmem_cache_alloc_node_noprof+0x3b1/0x410
>      __alloc_skb+0xde/0x830
>      igc_fpe_xmit_smd_frame.isra.0+0xad/0x1b0
>      igc_fpe_send_mpacket+0x37/0x90
>      ethtool_mmsv_verify_timer+0x15e/0x300
> 
> Cc: stable at vger.kernel.org
> Fixes: 5422570c0010 ("igc: add support for frame preemption verification")
> Signed-off-by: Kohei Enju <kohei at enjuk.jp>
> ---
> Changes:
>    v2:
>      - change to idiomatic style with goto (Simon)
>      - add Cc to stable (Alex)
>      - add reprodunction steps (Alex)
>    v1: https://lore.kernel.org/all/20260329145122.126040-1-kohei@enjuk.jp/
> ---
>   drivers/net/ethernet/intel/igc/igc_tsn.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
Tested-by: Avigail Dahan <avigailx.dahan at intel.com>