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virtiofs: add filesystem context source name check

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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: a62a8ef9d9 ("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>
This commit is contained in:
Xiangsheng Hou 2025-04-07 19:50:49 +08:00 • committed by Greg Kroah-Hartman
commit b84f13fdad
1 changed files with 3 additions and 0 deletions
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3
fs/fuse/virtio_fs.c
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@ -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.