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NFSD: fix problems with cleanup on errors in nfsd4_copy

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[ Upstream commit 81e722978ad21072470b73d8f6a50ad62c7d5b7d ]

When nfsd4_copy fails to allocate memory for async_copy->cp_src, or
nfs4_init_copy_state fails, it calls cleanup_async_copy to do the
cleanup for the async_copy which causes page fault since async_copy
is not yet initialized.

This patche rearranges the order of initializing the fields in
async_copy and adds checks in cleanup_async_copy to skip un-initialized
fields.

Fixes: ce0887ac96 ("NFSD add nfs4 inter ssc to nfsd4_copy")
Fixes: 87689df69491 ("NFSD: Shrink size of struct nfsd4_copy")
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Reviewed-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:
Dai Ngo 2023-01-31 11:12:29 -08:00 committed by Greg Kroah-Hartman
parent e5e1dc8284
commit 3db6c79de9
2 changed files with 11 additions and 6 deletions
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12
fs/nfsd/nfs4proc.c
View File

@ -1687,9 +1687,12 @@ static void cleanup_async_copy(struct nfsd4_copy *copy)
{
nfs4_free_copy_state(copy);
release_copy_files(copy);
spin_lock(&copy->cp_clp->async_lock);
list_del(&copy->copies);
spin_unlock(&copy->cp_clp->async_lock);
if (copy->cp_clp) {
spin_lock(&copy->cp_clp->async_lock);
if (!list_empty(&copy->copies))
list_del_init(&copy->copies);
spin_unlock(&copy->cp_clp->async_lock);
}
nfs4_put_copy(copy);
}
@ -1786,12 +1789,13 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
if (!async_copy)
goto out_err;
INIT_LIST_HEAD(&async_copy->copies);
refcount_set(&async_copy->refcount, 1);
async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
if (!async_copy->cp_src)
goto out_err;
if (!nfs4_init_copy_state(nn, copy))
goto out_err;
refcount_set(&async_copy->refcount, 1);
memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.cs_stid,
sizeof(copy->cp_res.cb_stateid));
dup_copy_fields(copy, async_copy);

5
fs/nfsd/nfs4state.c
View File

@ -990,7 +990,6 @@ static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
stid->cs_type = cs_type;
idr_preload(GFP_KERNEL);
spin_lock(&nn->s2s_cp_lock);
@ -1001,6 +1000,7 @@ static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
idr_preload_end();
if (new_id < 0)
return 0;
stid->cs_type = cs_type;
return 1;
}
@ -1034,7 +1034,8 @@ void nfs4_free_copy_state(struct nfsd4_copy *copy)
{
struct nfsd_net *nn;
WARN_ON_ONCE(copy->cp_stateid.cs_type != NFS4_COPY_STID);
if (copy->cp_stateid.cs_type != NFS4_COPY_STID)
return;
nn = net_generic(copy->cp_clp->net, nfsd_net_id);
spin_lock(&nn->s2s_cp_lock);
idr_remove(&nn->s2s_cp_stateids,