On 03/03/2020 19:26, Benoit Parrot wrote:
After the switch to use v4l2_async_notifier_add_subdev() and
v4l2_async_notifier_cleanup(), unloading the ti_cal module would casue 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.
Fixes: d079f94c9046 ("media: platform: Switch to v4l2_async_notifier_add_subdev")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Benoit Parrot <bparrot@xxxxxx>
---
drivers/media/platform/ti-vpe/cal.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c
index 6d4cbb8782ed..18fe2cb9dd17 100644
--- a/drivers/media/platform/ti-vpe/cal.c
+++ b/drivers/media/platform/ti-vpe/cal.c
@@ -372,8 +372,6 @@ 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;
@@ -2032,7 +2030,6 @@ static int of_cal_create_instance(struct cal_ctx *ctx, int inst)
parent = pdev->dev.of_node;
- asd = &ctx->asd;
endpoint = &ctx->endpoint;
ep_node = NULL;
@@ -2040,6 +2037,10 @@ static int of_cal_create_instance(struct cal_ctx *ctx, int inst)
sensor_node = NULL;
ret = -EINVAL;
+ asd = kzalloc(sizeof(*asd), GFP_KERNEL);
+ if (!asd)
+ goto cleanup_exit;
+
ctx_dbg(3, ctx, "Scanning Port node for csi2 port: %d\n", inst);
for (index = 0; index < CAL_NUM_CSI2_PORTS; index++) {
port = of_get_next_port(parent, port);
Thanks, this fixes the crash for me.
It does look a bit odd that something is allocated with kzalloc, and then it's freed somewhere
inside v4l2_async_notifier_cleanup, though. But if that's how it supposed to be used, looks fine to me.
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Tomi
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