linux-kernel - Re: [PATCH v1] mailbox: mchp-ipc-sbi: fix out-of-bounds access in mchp_ipc_get_cluster_aggr

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Message-ID: <20251113-unsealed-tightness-71a6826c63a1@spud>
Date: Thu, 13 Nov 2025 14:27:45 +0000
From: Conor Dooley <conor@...nel.org>
To: Valentina Fernandez <valentina.fernandezalanis@...rochip.com>
Cc: jassisinghbrar@...il.com, conor.dooley@...rochip.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] mailbox: mchp-ipc-sbi: fix out-of-bounds access in
 mchp_ipc_get_cluster_aggr_irq()

On Thu, Nov 13, 2025 at 01:49:22PM +0000, Valentina Fernandez wrote:
> The cluster_cfg array is dynamically allocated to hold per-CPU
> configuration structures, with its size based on the number of online
> CPUs. Previously, this array was indexed using hartid, which may be
> non-contiguous or exceed the bounds of the array, leading to
> out-of-bounds access.
> Switch to using cpuid as the index, as it is guaranteed to be within
> the valid range provided by for_each_online_cpu().
> 
> Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@...rochip.com>

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

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