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nfsd: call cache_put if xdr_reserve_space returns NULL

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[ Upstream commit d078cbf5c3 ]

If not enough buffer space available, but idmap_lookup has triggered
lookup_fn which calls cache_get and returns successfully. Then we
missed to call cache_put here which pairs with cache_get.

Fixes: ddd1ea5636 ("nfsd4: use xdr_reserve_space in attribute encoding")
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Reviwed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guoqing Jiang 2024-08-21 22:03:18 +08:00 committed by Greg Kroah-Hartman
parent b743922b5a
commit a1afbbb527
1 changed files with 9 additions and 4 deletions
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13
fs/nfsd/nfs4idmap.c
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@ -581,6 +581,7 @@ static __be32 idmap_id_to_name(struct xdr_stream *xdr,
.id = id, .id = id,
.type = type, .type = type,
}; };
__be32 status = nfs_ok;
__be32 *p; __be32 *p;
int ret; int ret;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
@ -593,12 +594,16 @@ static __be32 idmap_id_to_name(struct xdr_stream *xdr,
return nfserrno(ret); return nfserrno(ret);
ret = strlen(item->name); ret = strlen(item->name);
WARN_ON_ONCE(ret > IDMAP_NAMESZ); WARN_ON_ONCE(ret > IDMAP_NAMESZ);
p = xdr_reserve_space(xdr, ret + 4); p = xdr_reserve_space(xdr, ret + 4);
if (!p) if (unlikely(!p)) {
return nfserr_resource; status = nfserr_resource;
p = xdr_encode_opaque(p, item->name, ret); goto out_put;
}
xdr_encode_opaque(p, item->name, ret);
out_put:
cache_put(&item->h, nn->idtoname_cache); cache_put(&item->h, nn->idtoname_cache);
return 0; return status;
} }
static bool static bool