From b84f13fdad10a543e2e65bab7e81b3f0bceabd67 Mon Sep 17 00:00:00 2001 From: Xiangsheng Hou Date: Mon, 7 Apr 2025 19:50:49 +0800 Subject: [PATCH] virtiofs: add filesystem context source name check commit a94fd938df2b1628da66b498aa0eeb89593bc7a2 upstream. In certain scenarios, for example, during fuzz testing, the source name may be NULL, which could lead to a kernel panic. Therefore, an extra check for the source name should be added. Fixes: a62a8ef9d97d ("virtio-fs: add virtiofs filesystem") Cc: # all LTS kernels Signed-off-by: Xiangsheng Hou Link: https://lore.kernel.org/20250407115111.25535-1-xiangsheng.hou@mediatek.com Signed-off-by: Christian Brauner Signed-off-by: Greg Kroah-Hartman --- fs/fuse/virtio_fs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c index 48f144d08381..78113f1776f0 100644 --- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -1206,6 +1206,9 @@ static int virtio_fs_get_tree(struct fs_context *fsc) struct fuse_conn *fc; int err; + if (!fsc->source) + return invalf(fsc, "No source specified"); + /* This gets a reference on virtio_fs object. This ptr gets installed * in fc->iq->priv. Once fuse_conn is going away, it calls ->put() * to drop the reference to this object.