From: Marek Vasut Date: Fri, 1 Dec 2023 15:06:04 +0000 (+0100) Subject: media: nxp: imx8-isi: Check whether crossbar pad is non-NULL before access X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=eb2f932100288dbb881eadfed02e1459c6b9504c;p=linux.git media: nxp: imx8-isi: Check whether crossbar pad is non-NULL before access When translating source to sink streams in the crossbar subdev, the driver tries to locate the remote subdev connected to the sink pad. The remote pad may be NULL, if userspace tries to enable a stream that ends at an unconnected crossbar sink. When that occurs, the driver dereferences the NULL pad, leading to a crash. Prevent the crash by checking if the pad is NULL before using it, and return an error if it is. Cc: stable@vger.kernel.org # 6.1 Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver") Signed-off-by: Marek Vasut Reviewed-by: Kieran Bingham Reviewed-by: Fabio Estevam Reviewed-by: Laurent Pinchart Link: https://lore.kernel.org/r/20231201150614.63300-1-marex@denx.de Signed-off-by: Laurent Pinchart Acked-by: Sakari Ailus Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c index 575f173373887..1bb1334ec6f2b 100644 --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c @@ -160,8 +160,14 @@ mxc_isi_crossbar_xlate_streams(struct mxc_isi_crossbar *xbar, } pad = media_pad_remote_pad_first(&xbar->pads[sink_pad]); - sd = media_entity_to_v4l2_subdev(pad->entity); + if (!pad) { + dev_dbg(xbar->isi->dev, + "no pad connected to crossbar input %u\n", + sink_pad); + return ERR_PTR(-EPIPE); + } + sd = media_entity_to_v4l2_subdev(pad->entity); if (!sd) { dev_dbg(xbar->isi->dev, "no entity connected to crossbar input %u\n",