[PATCH v2] net/ixgbe: fix null dereference on EEPROM write for E610

[Bruce Richardson]

On Mon, Sep 28, 2026 at 04:12:53PM -0400, Sandeep Penigalapati wrote:
> E610 does not support EEPROM writes and leaves eeprom.ops.write_buffer
> as NULL. ixgbe_set_eeprom() calls this pointer without checking it,
> causing a NULL pointer dereference when a set-eeprom request is issued
> on an E610 port.
> 
> Check the op for NULL and return -ENOTSUP instead.
> 
> Fixes: 316637762a5f ("net/ixgbe/base: enable E610 device")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Sandeep Penigalapati <sandeep.penigalapati at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
> v2:
>  - Moved the NULL check before the argument validation so an
>    unsupported request returns -ENOTSUP instead of -EINVAL.
> 
>  drivers/net/intel/ixgbe/ixgbe_ethdev.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/intel/ixgbe/ixgbe_ethdev.c b/drivers/net/intel/ixgbe/ixgbe_ethdev.c
> index 78e19f94c0..b7b2b92e3c 100644
> --- a/drivers/net/intel/ixgbe/ixgbe_ethdev.c
> +++ b/drivers/net/intel/ixgbe/ixgbe_ethdev.c
> @@ -7362,6 +7362,9 @@ ixgbe_set_eeprom(struct rte_eth_dev *dev,
>  	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
>  		return -E_RTE_SECONDARY;
>  
> +	if (eeprom->ops.write_buffer == NULL)
> +		return -ENOTSUP;
> +
>  	first = in_eeprom->offset >> 1;
>  	length = in_eeprom->length >> 1;
>  	if ((first > hw->eeprom.word_size) ||
> -- 
> 2.27.0
>