On Fri, 10 Nov 2023 11:18:23 +0000 Dipendra Khadka wrote:

Syzkaller found a null pointer dereference in nsim_bpf
originating from the lack of a null check for state.

This patch fixes the issue by adding a check for state
in two functions nsim_prog_set_loaded() and nsim_setup_prog_hw_checks()

Reported-by: syzbot+44c2416196b7c607f226@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com./bug?extid=44c2416196b7c607f226
Fixes: 31d3ad832948 ("netdevsim: add bpf offload support")

Don't think so. It's probably due to Stan's extensions / reuse of 
the offload infra.

Please put more effort into figuring out when and why this started
happening. Describe your findings in the commit message.

Current patch looks too much like a bandaid.

Before you repost read:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html
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