Subject: Re: [PATCH net] net: dsa: don't dereference NULL extack in dsa_slave_changeupper()

From: [email-masked]
Date: Tue, 23 Aug 2022 15:10:15 +0000

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <[email-masked]>:

On Fri, 19 Aug 2022 20:39:25 +0300 you wrote:
> When a driver returns -EOPNOTSUPP in dsa_port_bridge_join() but failed
> to provide a reason for it, DSA attempts to set the extack to say that
> software fallback will kick in.
> 
> The problem is, when we use brctl and the legacy bridge ioctls, the
> extack will be NULL, and DSA dereferences it in the process of setting
> it.
> 
> [...]

Here is the summary with links:
  - [net] net: dsa: don't dereference NULL extack in dsa_slave_changeupper()
    https://git.kernel.org/netdev/net/c/855a28f9c96c

You are awesome, thank you!
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