[PATCH 5.14 240/849] media: atomisp: Fix error handling in probe

Greg Kroah-Hartman
2021-11-15T22:17:55Z

From: Evgeny Novikov <novikov@ispras.ru>

[ Upstream commit e16f5e39acd6d10cc63ae39bc0a77188ed828f22 ]

There were several issues with handling errors in lm3554_probe():
- Probe did not set the error code when v4l2_ctrl_handler_init() failed.
- It intermixed gotos for handling errors of v4l2_ctrl_handler_init()
and media_entity_pads_init().
- It did not set the error code for failures of v4l2_ctrl_new_custom().
- Probe did not free resources in case of failures of
atomisp_register_i2c_module().

The patch fixes all these issues.

Found by Linux Driver Verification project (linuxtesting.org).

Link: https://lore.kernel.org/linux-media/20210810162943.19852-1-novikov@ispras.ru
Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../media/atomisp/i2c/atomisp-lm3554.c | 37 ++++++++++++-------
1 file changed, 24 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c b/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
index 362ed44b4effa..e046489cd253b 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-lm3554.c
@@ -835,7 +835,6 @@ static int lm3554_probe(struct i2c_client *client)
int err = 0;
struct lm3554 *flash;
unsigned int i;
- int ret;

flash = kzalloc(sizeof(*flash), GFP_KERNEL);
if (!flash)
@@ -844,7 +843,7 @@ static int lm3554_probe(struct i2c_client *client)
flash->pdata = lm3554_platform_data_func(client);
if (IS_ERR(flash->pdata)) {
err = PTR_ERR(flash->pdata);
- goto fail1;
+ goto free_flash;
}

v4l2_i2c_subdev_init(&flash->sd, client, &lm3554_ops);
@@ -852,12 +851,12 @@ static int lm3554_probe(struct i2c_client *client)
flash->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
flash->mode = ATOMISP_FLASH_MODE_OFF;
flash->timeout = LM3554_MAX_TIMEOUT / LM3554_TIMEOUT_STEPSIZE - 1;
- ret =
+ err =
v4l2_ctrl_handler_init(&flash->ctrl_handler,
ARRAY_SIZE(lm3554_controls));
- if (ret) {
+ if (err) {
dev_err(&client->dev, "error initialize a ctrl_handler.\n");
- goto fail3;
+ goto unregister_subdev;
}

for (i = 0; i < ARRAY_SIZE(lm3554_controls); i++)
@@ -866,14 +865,15 @@ static int lm3554_probe(struct i2c_client *client)

if (flash->ctrl_handler.error) {
dev_err(&client->dev, "ctrl_handler error.\n");
- goto fail3;
+ err = flash->ctrl_handler.error;
+ goto free_handler;
}

flash->sd.ctrl_handler = &flash->ctrl_handler;
err = media_entity_pads_init(&flash->sd.entity, 0, NULL);
if (err) {
dev_err(&client->dev, "error initialize a media entity.\n");
- goto fail2;
+ goto free_handler;
}

flash->sd.entity.function = MEDIA_ENT_F_FLASH;
@@ -884,16 +884,27 @@ static int lm3554_probe(struct i2c_client *client)

err = lm3554_gpio_init(client);
if (err) {
- dev_err(&client->dev, "gpio request/direction_output fail");
- goto fail3;
+ dev_err(&client->dev, "gpio request/direction_output fail.\n");
+ goto cleanup_media;
+ }
+
+ err = atomisp_register_i2c_module(&flash->sd, NULL, LED_FLASH);
+ if (err) {
+ dev_err(&client->dev, "fail to register atomisp i2c module.\n");
+ goto uninit_gpio;
}
- return atomisp_register_i2c_module(&flash->sd, NULL, LED_FLASH);
-fail3:
+
+ return 0;
+
+uninit_gpio:
+ lm3554_gpio_uninit(client);
+cleanup_media:
media_entity_cleanup(&flash->sd.entity);
+free_handler:
v4l2_ctrl_handler_free(&flash->ctrl_handler);
-fail2:
+unregister_subdev:
v4l2_device_unregister_subdev(&flash->sd);
-fail1:
+free_flash:
kfree(flash);

return err;
--
2.33.0