[PATCH 5.10 097/717] virtiofs fix leak in setup

Greg Kroah-Hartman
2020-12-28T14:04:20Z

From: Miklos Szeredi <mszeredi@redhat.com>

[ Upstream commit 66ab33bf6d4341574f88b511e856a73f6f2a921e ]

This can be triggered for example by adding the "-omand" mount option,
which will be rejected and virtio_fs_fill_super() will return an error.

In such a case the allocations for fuse_conn and fuse_mount will leak due
to s_root not yet being set and so ->put_super() not being called.

Fixes: a62a8ef9d97d ("virtio-fs: add virtiofs filesystem")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/fuse/virtio_fs.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 21a9e534417c0..d2c0e58c6416f 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -1464,6 +1464,8 @@ static int virtio_fs_get_tree(struct fs_context *fsc)
if (!sb->s_root) {
err = virtio_fs_fill_super(sb, fsc);
if (err) {
+ fuse_mount_put(fm);
+ sb->s_fs_info = NULL;
deactivate_locked_super(sb);
return err;
}
--
2.27.0