From: Benoit Parrot bparrot@ti.com
commit 80264809ea0a3fd2ee8251f31a9eb85d2c3fc77e upstream.
After the switch to use v4l2_async_notifier_add_subdev() and v4l2_async_notifier_cleanup(), unloading the ti_cal module would cause a kernel oops.
This was root cause to the fact that v4l2_async_notifier_cleanup() tries to kfree the asd pointer passed into v4l2_async_notifier_add_subdev().
In our case the asd reference was from a statically allocated struct. So in effect v4l2_async_notifier_cleanup() was trying to free a pointer that was not kalloc.
So here we switch to using a kzalloc struct instead of a static one. To achieve this we re-order some of the calls to prevent asd allocation from leaking.
Fixes: d079f94c9046 ("media: platform: Switch to v4l2_async_notifier_add_subdev") Cc: stable@vger.kernel.org Signed-off-by: Benoit Parrot bparrot@ti.com Reviewed-by: Tomi Valkeinen tomi.valkeinen@ti.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/platform/ti-vpe/cal.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/media/platform/ti-vpe/cal.c +++ b/drivers/media/platform/ti-vpe/cal.c @@ -266,8 +266,6 @@ struct cal_ctx { struct v4l2_subdev *sensor; struct v4l2_fwnode_endpoint endpoint;
- struct v4l2_async_subdev asd; - struct v4l2_fh fh; struct cal_dev *dev; struct cc_data *cc; @@ -1648,7 +1646,6 @@ static int of_cal_create_instance(struct
parent = pdev->dev.of_node;
- asd = &ctx->asd; endpoint = &ctx->endpoint;
ep_node = NULL; @@ -1695,8 +1692,6 @@ static int of_cal_create_instance(struct ctx_dbg(3, ctx, "can't get remote parent\n"); goto cleanup_exit; } - asd->match_type = V4L2_ASYNC_MATCH_FWNODE; - asd->match.fwnode = of_fwnode_handle(sensor_node);
v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep_node), endpoint);
@@ -1726,9 +1721,17 @@ static int of_cal_create_instance(struct
v4l2_async_notifier_init(&ctx->notifier);
+ asd = kzalloc(sizeof(*asd), GFP_KERNEL); + if (!asd) + goto cleanup_exit; + + asd->match_type = V4L2_ASYNC_MATCH_FWNODE; + asd->match.fwnode = of_fwnode_handle(sensor_node); + ret = v4l2_async_notifier_add_subdev(&ctx->notifier, asd); if (ret) { ctx_err(ctx, "Error adding asd\n"); + kfree(asd); goto cleanup_exit; }