linux-kernel - Re: [PATCH v3 net 2/4] pds_core: handle unsupported PDS_CORE_CMD_FW

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Message-ID: <ceeaf753-f6ab-4ea1-a955-c53409cddbe8@intel.com>
Date: Wed, 16 Apr 2025 13:14:22 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Shannon Nelson <shannon.nelson@....com>, <andrew+netdev@...n.ch>,
	<brett.creeley@....com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <michal.swiatkowski@...ux.intel.com>,
	<horms@...nel.org>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 net 2/4] pds_core: handle unsupported
 PDS_CORE_CMD_FW_CONTROL result



On 4/15/2025 4:29 PM, 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>
> Reviewed-by: Simon Horman <horms@...nel.org>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> ---
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>