* [PATCH] virtiofs: add filesystem context source name check
@ 2025-02-21 2:03 Xiangsheng Hou
0 siblings, 0 replies; only message in thread
From: Xiangsheng Hou @ 2025-02-21 2:03 UTC (permalink / raw)
To: Vivek Goyal, Stefan Hajnoczi, Miklos Szeredi, eperezma,
Matthias Brugger, AngeloGioacchino Del Regno
Cc: virtualization, linux-fsdevel, linux-kernel, linux-arm-kernel,
linux-mediatek, xiangsheng.hou, benliang.zhao, bin.zhang
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.
Signed-off-by: Xiangsheng Hou <xiangsheng.hou@mediatek.com>
---
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 2c7b24cb67ad..53c2626e90e7 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -1669,6 +1669,9 @@ static int virtio_fs_get_tree(struct fs_context *fsc)
unsigned int virtqueue_size;
int err = -EIO;
+ 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.
--
2.46.0
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