Re: [PATCH v5] ptp: ocp: Limit signal/freq counts in summary output functions

[Simon Horman]

On Wed, May 14, 2025 at 10:35:41AM +0300, Sagi Maimon wrote:
> The debugfs summary output could access uninitialized elements in
> the freq_in[] and signal_out[] arrays, causing NULL pointer
> dereferences and triggering a kernel Oops (page_fault_oops).
> This patch adds u8 fields (nr_freq_in, nr_signal_out) to track the
> number of initialized elements, with a maximum of 4 per array.
> The summary output functions are updated to respect these limits,
> preventing out-of-bounds access and ensuring safe array handling.
> 
> Signed-off-by: Sagi Maimon <maimon.sagi@xxxxxxxxx>
> ---
> Addressed comments from Vadim Fedorenko:
> - https://www.spinics.net/lists/kernel/msg5683022.html
> Addressed comments from Jakub Kicinski:
> - https://www.spinics.net/lists/netdev/msg1091131.html
> Changes since v4:
> - remove fix from signal/freq show/store routines.

Reviewed-by: Simon Horman <horms@xxxxxxxxxx>