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authorXin Xiong <xiongx18@fudan.edu.cn>2022-01-25 14:10:45 +0100
committerTrond Myklebust <trond.myklebust@hammerspace.com>2022-02-26 00:50:12 +0100
commitb7f114edd54326f730a754547e7cfb197b5bc132 (patch)
tree57ec0fd2a36c1de2becf1b6973d43812f1a27f07
parentConvert NFS from readpages to readahead (diff)
downloadlinux-b7f114edd54326f730a754547e7cfb197b5bc132.tar.xz
linux-b7f114edd54326f730a754547e7cfb197b5bc132.zip
NFSv4.2: fix reference count leaks in _nfs42_proc_copy_notify()
[You don't often get email from xiongx18@fudan.edu.cn. Learn why this is important at http://aka.ms/LearnAboutSenderIdentification.] 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> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
-rw-r--r--fs/nfs/nfs42proc.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 32129446beca..ca878d021fab 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -591,8 +591,10 @@ 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);
@@ -600,7 +602,7 @@ 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,
@@ -609,6 +611,7 @@ 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;
}