Re: [PATCH v4 bpf 1/2] bpf: fix skb_do_redirect return values

[Dan Carpenter]

I'm not a networking person, but I was looking at some use after free
static checker warnings.

Apparently the rule with xmit functions is that if they return a value
> 15 then that means the skb was not freed.  Otherwise it's supposed to
be freed.  So like NETDEV_TX_BUSY is 0x10 so it's not freed.

This is checked with using the dev_xmit_complete() function.  So I feel
like it would make sense for LWTUNNEL_XMIT_CONTINUE to return higher
than 15.

Because that's the bug right?  The original code was assuming that
everything besides LWTUNNEL_XMIT_DONE was freed.

regards,
dan carpenter