From 6d3a2dca549bd0359acae3f6b9fd8199c4e092f5 Mon Sep 17 00:00:00 2001 From: Misono Tomohiro Date: Wed, 28 Aug 2019 17:01:22 +0900 Subject: NFS: direct.c: Fix memory leak of dreq when nfs_get_lock_context fails [ Upstream commit 8605cf0e852af3b2c771c18417499dc4ceed03d5 ] When dreq is allocated by nfs_direct_req_alloc(), dreq->kref is initialized to 2. Therefore we need to call nfs_direct_req_release() twice to release the allocated dreq. Usually it is called in nfs_file_direct_{read, write}() and nfs_direct_complete(). However, current code only calls nfs_direct_req_relese() once if nfs_get_lock_context() fails in nfs_file_direct_{read, write}(). So, that case would result in memory leak. Fix this by adding the missing call. Signed-off-by: Misono Tomohiro Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/direct.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 53f0012ace42..de135d2591ff 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -595,6 +595,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter) l_ctx = nfs_get_lock_context(dreq->ctx); if (IS_ERR(l_ctx)) { result = PTR_ERR(l_ctx); + nfs_direct_req_release(dreq); goto out_release; } dreq->l_ctx = l_ctx; @@ -1019,6 +1020,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter) l_ctx = nfs_get_lock_context(dreq->ctx); if (IS_ERR(l_ctx)) { result = PTR_ERR(l_ctx); + nfs_direct_req_release(dreq); goto out_release; } dreq->l_ctx = l_ctx; -- cgit v1.2.3