5.4-stable review patch. If anyone has any objections, please let me know.
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From: Xiangsheng Hou xiangsheng.hou@mediatek.com
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: stable@vger.kernel.org # all LTS kernels Signed-off-by: Xiangsheng Hou xiangsheng.hou@mediatek.com Link: https://lore.kernel.org/20250407115111.25535-1-xiangsheng.hou@mediatek.com Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/fuse/virtio_fs.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -1206,6 +1206,9 @@ static int virtio_fs_get_tree(struct fs_ 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.