[PATCH 5.15 5/5] NFSD: Never decrement pending_async_copies on error

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

[ Upstream commit 8286f8b622990194207df9ab852e0f87c60d35e9 ]

The error flow in nfsd4_copy() calls cleanup_async_copy(), which
already decrements nn->pending_async_copies.

Reported-by: Olga Kornievskaia <okorniev@redhat.com>
Fixes: aadc3bbea163 ("NFSD: Limit the number of concurrent async COPY operations")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4proc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 6267a41092ae..0b698e25826f 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1791,10 +1791,8 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		refcount_set(&async_copy->refcount, 1);
 		/* Arbitrary cap on number of pending async copy operations */
 		if (atomic_inc_return(&nn->pending_async_copies) >
-				(int)rqstp->rq_pool->sp_nrthreads) {
-			atomic_dec(&nn->pending_async_copies);
+				(int)rqstp->rq_pool->sp_nrthreads)
 			goto out_err;
-		}
 		async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
 		if (!async_copy->cp_src)
 			goto out_err;
-- 
2.47.0