Re: [PATCH v2 net 3/5] pds_core: handle unsupported PDS_CORE_CMD_FW_CONTROL result

[Simon Horman]

On Thu, Apr 10, 2025 at 05:32:07PM -0700, Shannon Nelson wrote:
> From: Brett Creeley <brett.creeley@xxxxxxx>
> 
> 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@xxxxxxx>
> Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>

Reviewed-by: Simon Horman <horms@xxxxxxxxxx>