linux-kernel - Re: [PATCH v2] ptp: ocp: Limit SMA/signal/freq counts in show/store functions

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Message-ID: <20250509204334.GT3339421@horms.kernel.org>
Date: Fri, 9 May 2025 21:43:34 +0100
From: Simon Horman <horms@...nel.org>
To: Sagi Maimon <maimon.sagi@...il.com>
Cc: jonathan.lemon@...il.com, vadim.fedorenko@...ux.dev,
	richardcochran@...il.com, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] ptp: ocp: Limit SMA/signal/freq counts in show/store
 functions

On Thu, May 08, 2025 at 10:19:01AM +0300, Sagi Maimon wrote:
> The sysfs show/store operations could access uninitialized elements in
> the freq_in[], signal_out[], and sma[] arrays, leading to NULL pointer
> dereferences. This patch introduces u8 fields (nr_freq_in, nr_signal_out,
> nr_sma) to track the actual number of initialized elements, capping the
> maximum at 4 for each array. The affected 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>
> ---
> Addressed comments from Simon Horman:
>  - https://www.spinics.net/lists/netdev/msg1089986.html
> Changes since v1:
>  - Increase label buffer size from 8 to 16 bytes to prevent potential buffer
>    overflow warnings from GCC 14.2.0 during string formatting.

Reviewed-by: Simon Horman <horms@...nel.org>