linux-kernel - Re: [PATCH v2 net 3/5] pds_core: handle unsupported PDS_CORE_CMD_FW

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Message-ID: <20250411190025.GQ395307@horms.kernel.org>
Date: Fri, 11 Apr 2025 20:00:25 +0100
From: Simon Horman <horms@...nel.org>
To: Shannon Nelson <shannon.nelson@....com>
Cc: andrew+netdev@...n.ch, brett.creeley@....com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	michal.swiatkowski@...ux.intel.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 net 3/5] pds_core: handle unsupported
 PDS_CORE_CMD_FW_CONTROL result

On Thu, Apr 10, 2025 at 05:32:07PM -0700, Shannon Nelson wrote:
> From: Brett Creeley <brett.creeley@....com>
> 
> If the FW doesn't support the PDS_CORE_CMD_FW_CONTROL command
> the driver might at the least print garbage and at the worst
> crash when the user runs the "devlink dev info" devlink command.
> 
> This happens because the stack variable fw_list is not 0
> initialized which results in fw_list.num_fw_slots being a
> garbage value from the stack.  Then the driver tries to access
> fw_list.fw_names[i] with i >= ARRAY_SIZE and runs off the end
> of the array.
> 
> Fix this by initializing the fw_list and by not failing
> completely if the devcmd fails because other useful information
> is printed via devlink dev info even if the devcmd fails.
> 
> Fixes: 45d76f492938 ("pds_core: set up device and adminq")
> Signed-off-by: Brett Creeley <brett.creeley@....com>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>

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