Re: [PATCH] nfsd: return -EINVAL when namelen is 0

[Chuck Lever]

On Tue, 03 Sep 2024 19:14:46 +0800, Li Lingfeng wrote:
> When we have a corrupted main.sqlite in /var/lib/nfs/nfsdcld/, it may
> result in namelen being 0, which will cause memdup_user() to return
> ZERO_SIZE_PTR.
> When we access the name.data that has been assigned the value of
> ZERO_SIZE_PTR in nfs4_client_to_reclaim(), null pointer dereference is
> triggered.
> 
> [...]

Kept the new dprintk call sites since this is not a hot path and
there needs to be some observability here rather than a silent
failure. I'm not convinced the error text is especially clear, but
I don't have a better suggestion at the moment.

Applied to nfsd-next for v6.12, thanks!

[1/1] nfsd: return -EINVAL when namelen is 0
      commit: e492841732bbce2b2dd19cd285d5e7f61b1bdaee


-- 
Chuck Lever