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authorJeff Layton <jlayton@kernel.org>2023-01-17 22:38:31 +0300
committerChuck Lever <chuck.lever@oracle.com>2023-02-20 17:20:52 +0300
commit6ba434cb1a8d403ea9aad1b667c3ea3ad8b3191f (patch)
tree81aaf65f862cce3b354f54ab5500b50e92a79a69 /fs/nfsd
parent1f0001d43d0c0ac2a19a34a914f6595ad97cbc1d (diff)
downloadlinux-6ba434cb1a8d403ea9aad1b667c3ea3ad8b3191f.tar.xz
nfsd: clean up potential nfsd_file refcount leaks in COPY codepath
There are two different flavors of the nfsd4_copy struct. One is embedded in the compound and is used directly in synchronous copies. The other is dynamically allocated, refcounted and tracked in the client struture. For the embedded one, the cleanup just involves releasing any nfsd_files held on its behalf. For the async one, the cleanup is a bit more involved, and we need to dequeue it from lists, unhash it, etc. There is at least one potential refcount leak in this code now. If the kthread_create call fails, then both the src and dst nfsd_files in the original nfsd4_copy object are leaked. The cleanup in this codepath is also sort of weird. In the async copy case, we'll have up to four nfsd_file references (src and dst for both flavors of copy structure). They are both put at the end of nfsd4_do_async_copy, even though the ones held on behalf of the embedded one outlive that structure. Change it so that we always clean up the nfsd_file refs held by the embedded copy structure before nfsd4_copy returns. Rework cleanup_async_copy to handle both inter and intra copies. Eliminate nfsd4_cleanup_intra_ssc since it now becomes a no-op. Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4proc.c23
1 files changed, 10 insertions, 13 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 95234c8060d5..c9057462b973 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1512,7 +1512,6 @@ nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
long timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
nfs42_ssc_close(filp);
- nfsd_file_put(dst);
fput(filp);
spin_lock(&nn->nfsd_ssc_lock);
@@ -1562,13 +1561,6 @@ nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
&copy->nf_dst);
}
-static void
-nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
-{
- nfsd_file_put(src);
- nfsd_file_put(dst);
-}
-
static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
{
struct nfsd4_cb_offload *cbo =
@@ -1683,12 +1675,18 @@ static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
dst->ss_nsui = src->ss_nsui;
}
+static void release_copy_files(struct nfsd4_copy *copy)
+{
+ if (copy->nf_src)
+ nfsd_file_put(copy->nf_src);
+ if (copy->nf_dst)
+ nfsd_file_put(copy->nf_dst);
+}
+
static void cleanup_async_copy(struct nfsd4_copy *copy)
{
nfs4_free_copy_state(copy);
- nfsd_file_put(copy->nf_dst);
- if (!nfsd4_ssc_is_inter(copy))
- nfsd_file_put(copy->nf_src);
+ release_copy_files(copy);
spin_lock(&copy->cp_clp->async_lock);
list_del(&copy->copies);
spin_unlock(&copy->cp_clp->async_lock);
@@ -1748,7 +1746,6 @@ static int nfsd4_do_async_copy(void *data)
} else {
nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
copy->nf_dst->nf_file, false);
- nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
}
do_callback:
@@ -1811,9 +1808,9 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
} else {
status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
copy->nf_dst->nf_file, true);
- nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
}
out:
+ release_copy_files(copy);
return status;
out_err:
if (async_copy)