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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-06-27 17:33:38 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2017-06-27 21:44:58 -0400
commitbd171930e6a3de4f5cffdafbb944e50093dfb59b (patch)
tree4a6fba8ee37663af6c2405c631ec612c9ba4651a
parentNFS: Trunking detection should handle ERESTARTSYS/EINTR (diff)
downloadlinux-dev-bd171930e6a3de4f5cffdafbb944e50093dfb59b.tar.xz
linux-dev-bd171930e6a3de4f5cffdafbb944e50093dfb59b.zip
NFSv4.1: Fix a race in nfs4_proc_layoutget
If the task calling layoutget is signalled, then it is possible for the calls to nfs4_sequence_free_slot() and nfs4_layoutget_prepare() to race, in which case we leak a slot. The fix is to move the call to nfs4_sequence_free_slot() into the nfs4_layoutget_release() so that it gets called at task teardown time. Fixes: 2e80dbe7ac51 ("NFSv4.1: Close callback races for OPEN, LAYOUTGET...") Cc: stable@vger.kernel.org # v4.8+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/nfs4proc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4e43fd1270c4..dbfa18900e25 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8417,6 +8417,7 @@ static void nfs4_layoutget_release(void *calldata)
size_t max_pages = max_response_pages(server);
dprintk("--> %s\n", __func__);
+ nfs4_sequence_free_slot(&lgp->res.seq_res);
nfs4_free_pages(lgp->args.layout.pages, max_pages);
pnfs_put_layout_hdr(NFS_I(inode)->layout);
put_nfs_open_context(lgp->args.ctx);
@@ -8491,7 +8492,6 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
/* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
if (status == 0 && lgp->res.layoutp->len)
lseg = pnfs_layout_process(lgp);
- nfs4_sequence_free_slot(&lgp->res.seq_res);
rpc_put_task(task);
dprintk("<-- %s status=%d\n", __func__, status);
if (status)