Messages in this thread Patch in this message | | | From | Xin Xiong <> | Subject | [PATCH] NFSv4.2: fix reference count leaks in _nfs42_proc_copy_notify() | Date | Tue, 25 Jan 2022 21:10:45 +0800 |
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The reference counting issue happens in two error paths in the function _nfs42_proc_copy_notify(). In both error paths, the function simply returns the error code and forgets to balance the refcount of object `ctx`, bumped by get_nfs_open_context() earlier, which may cause refcount leaks.
Fix it by balancing refcount of the `ctx` object before the function returns in both error paths.
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn> Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> --- fs/nfs/nfs42proc.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c index 8b21ff1be..438de4f93 100644 --- a/fs/nfs/nfs42proc.c +++ b/fs/nfs/nfs42proc.c @@ -592,8 +592,10 @@ static int _nfs42_proc_copy_notify(struct file *src, struct file *dst, ctx = get_nfs_open_context(nfs_file_open_context(src)); l_ctx = nfs_get_lock_context(ctx); - if (IS_ERR(l_ctx)) - return PTR_ERR(l_ctx); + if (IS_ERR(l_ctx)) { + status = PTR_ERR(l_ctx); + goto out; + } status = nfs4_set_rw_stateid(&args->cna_src_stateid, ctx, l_ctx, FMODE_READ); @@ -601,7 +603,7 @@ static int _nfs42_proc_copy_notify(struct file *src, struct file *dst, if (status) { if (status == -EAGAIN) status = -NFS4ERR_BAD_STATEID; - return status; + goto out; } status = nfs4_call_sync(src_server->client, src_server, &msg, @@ -610,6 +612,7 @@ static int _nfs42_proc_copy_notify(struct file *src, struct file *dst, if (status == -ENOTSUPP) src_server->caps &= ~NFS_CAP_COPY_NOTIFY; +out: put_nfs_open_context(nfs_file_open_context(src)); return status; } -- 2.25.1
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