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Commit 689d7ba4 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd: fix cleanup of nfsd_reply_cache_init on failure 



The failure to unregister the shrinker results will result in corruption
when the nfsd_net is freed.

Also clean up the drc_slab while we're here.

Reported-by: default avatar <syzbot+83a43746cebef3508b49@syzkaller.appspotmail.com>
Fixes: db17b61765c2 ("nfsd4: drc containerization")
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 30498dcc

fs/nfsd/nfscache.c

+7 −3
Original line number Diff line number Diff line
@@ -157,12 +157,12 @@ int nfsd_reply_cache_init(struct nfsd_net *nn) 
	nn->nfsd_reply_cache_shrinker.seeks = 1;

	status = register_shrinker(&nn->nfsd_reply_cache_shrinker);

	if (status)

		return status;

		goto out_nomem;



	nn->drc_slab = kmem_cache_create("nfsd_drc",

				sizeof(struct svc_cacherep), 0, 0, NULL);

	if (!nn->drc_slab)

		goto out_nomem;

		goto out_shrinker;



	nn->drc_hashtbl = kcalloc(hashsize,

				sizeof(*nn->drc_hashtbl), GFP_KERNEL);
@@ -170,7 +170,7 @@ int nfsd_reply_cache_init(struct nfsd_net *nn) 
		nn->drc_hashtbl = vzalloc(array_size(hashsize,

						 sizeof(*nn->drc_hashtbl)));

		if (!nn->drc_hashtbl)

			goto out_nomem;

			goto out_slab;

	}



	for (i = 0; i < hashsize; i++) {
@@ -180,6 +180,10 @@ int nfsd_reply_cache_init(struct nfsd_net *nn) 
	nn->drc_hashsize = hashsize;



	return 0;

out_slab:

	kmem_cache_destroy(nn->drc_slab);

out_shrinker:

	unregister_shrinker(&nn->nfsd_reply_cache_shrinker);

out_nomem:

	printk(KERN_ERR "nfsd: failed to allocate reply cache\n");

	return -ENOMEM;