Re: [PATCH net-next] net: mscc: ocelot: fix error handling bugs in mscc_ocelot_init_ports()

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Tue, 2 Feb 2021 12:12:38 +0300 you wrote:

There are several error handling bugs in mscc_ocelot_init_ports().  I
went through the code, and carefully audited it and made fixes and
cleanups.

1) The ocelot_probe_port() function didn't have a mirror release function
   so it was hard to follow.  I created the ocelot_release_port()
   function.
2) In the ocelot_probe_port() function, if the register_netdev() call
   failed, then it lead to a double free_netdev(dev) bug.  Fix this by
   setting "ocelot->ports[port] = NULL" on the error path.
3) I was concerned that the "port" which comes from of_property_read_u32()
   might be out of bounds so I added a check for that.
4) In the original code if ocelot_regmap_init() failed then the driver
   tried to continue but I think that should be a fatal error.
5) If ocelot_probe_port() failed then the most recent devlink was leaked.
   The fix for mostly came Vladimir Oltean.  Get rid of "registered_ports"
   and just set a bit in "devlink_ports_registered" to say when the
   devlink port has been registered (and needs to be unregistered on
   error).  There are fewer than 32 ports so a u32 is large enough for
   this purpose.
6) The error handling if the final ocelot_port_devlink_init() failed had
   two problems.  The "while (port-- >= 0)" loop should have been
   "--port" pre-op instead of a post-op to avoid a buffer underflow.
   The "if (!registered_ports[port])" condition was reversed leading to
   resource leaks and double frees.

[...]

Here is the summary with links:
  - [net-next] net: mscc: ocelot: fix error handling bugs in mscc_ocelot_init_ports()
    https://git.kernel.org/netdev/net-next/c/e0c16233577f
  - [v3,2/2,net-next] net: mscc: ocelot: fix error code in mscc_ocelot_probe()
    https://git.kernel.org/netdev/net-next/c/4160d9ec5b41

You are awesome, thank you!
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