[PATCH v2] lib/ethdev: fix segfault in secondary process by validating dev_private pointer

[Stephen Hemminger]

On Wed, 23 Jul 2025 00:50:22 -0400
Khadem Ullah <14pwcse1224 at uetpeshawar.edu.pk> wrote:

> In secondary processes, directly accessing 'dev->data->dev_private' can
> cause a segmentation fault if the primary process has exited or if the
> shared memory is no longer accessible.
> 
> This patch adds a safety check using rte_mem_virt2phy(), with an
> unlikely() branch hint to minimize performance impact in the fast path.
> This ensures 'dev_private' is still valid before accessing it.
> 
> Fixes: bdad90d12ec8 ("ethdev: change device info get callback to return int")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Khadem Ullah <14pwcse1224 at uetpeshawar.edu.pk>
> ---

No still a band-aid solution, and it is depending on side effects.

Is your secondary process monitoring for primary process exiting?

If it is, then lets fix the monitoring path.