linux-kernel - Re: [PATCH v4] ptp: ocp: Limit signal/freq counts in show/store functions

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Message-ID: <3bbf0da2-9ac8-4df6-8c02-a552fc599083@linux.dev>
Date: Sun, 11 May 2025 22:16:34 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Sagi Maimon <maimon.sagi@...il.com>, jonathan.lemon@...il.com,
 richardcochran@...il.com, andrew+netdev@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4] ptp: ocp: Limit signal/freq counts in show/store
 functions

On 11/05/2025 16:42, Sagi Maimon wrote:
> The sysfs show/store operations could access uninitialized elements
> in the freq_in[] and signal_out[] arrays, leading to NULL pointer
> dereferences. This patch introduces u8 fields (nr_freq_in,
> nr_signal_out) to track the number of initialized elements, capping
> the maximum at 4 for each array. The show/store functions are updated
> to respect these limits, preventing out-of-bounds access and ensuring
> safe array handling.
> 
> Signed-off-by: Sagi Maimon <maimon.sagi@...il.com>

LGTM,
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>