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Subject[PATCH] media: i2c: lm3560: Fix possible memory leak in lm3560_probe()
Date
In the error handling path of lm3560_probe(), ctrl handler allocated by
lm3560_subdev_init() does not released, and caused memory leak as
follows:

unreferenced object 0xffff888257dbac10 (size 16):
comm "35", pid 6061, jiffies 4299029793 (age 201.830s)
hex dump (first 16 bytes):
40 06 ff 0c 81 88 ff ff 40 24 ff 0c 81 88 ff ff @.......@$......
backtrace:
[<ffffffff8167939c>] slab_post_alloc_hook+0x9c/0x490
[<ffffffff8167e3eb>] __kmalloc_node+0x16b/0x3a0
[<ffffffff815a27df>] kvmalloc_node+0x4f/0xf0
[<ffffffff832807a9>] v4l2_ctrl_handler_init_class+0xf9/0x160
[<ffffffffa01f8180>] lm3560_subdev_init+0x120/0x340 [lm3560]
[<ffffffffa01f882c>] lm3560_probe+0x17c/0x370 [lm3560]
[<ffffffff8321d463>] i2c_device_probe+0x5d3/0x600
[<ffffffff82b59630>] really_probe+0x190/0x480
[<ffffffff82b59a19>] __driver_probe_device+0xf9/0x180
[<ffffffff82b59af3>] driver_probe_device+0x53/0x130
[<ffffffff82b5a075>] __device_attach_driver+0x105/0x130
[<ffffffff82b55949>] bus_for_each_drv+0x129/0x190
[<ffffffff82b593c9>] __device_attach+0x1c9/0x270
[<ffffffff82b5a250>] device_initial_probe+0x20/0x30
[<ffffffff82b579c2>] bus_probe_device+0x142/0x160
[<ffffffff82b52e49>] device_add+0x829/0x1300
unreferenced object 0xffff888255118100 (size 256):

Fix the error handling path to avoid memory leak.

Fixes: 7f6b11a18c30 ("[media] media: i2c: add driver for dual LED Flash, lm3560")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
---
drivers/media/i2c/lm3560.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/lm3560.c b/drivers/media/i2c/lm3560.c
index 9e34ccce4fc3..8bd60b14b867 100644
--- a/drivers/media/i2c/lm3560.c
+++ b/drivers/media/i2c/lm3560.c
@@ -432,15 +432,22 @@ static int lm3560_probe(struct i2c_client *client,

rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
if (rval < 0)
- return rval;
+ goto err_subdev_init_led1;

rval = lm3560_init_device(flash);
if (rval < 0)
- return rval;
+ goto err_init_device;

i2c_set_clientdata(client, flash);

return 0;
+
+err_init_device:
+ v4l2_ctrl_handler_free(&flash->ctrls_led[LM3560_LED1]);
+err_subdev_init_led1:
+ v4l2_ctrl_handler_free(&flash->ctrls_led[LM3560_LED0]);
+
+ return rval;
}

static int lm3560_remove(struct i2c_client *client)
--
2.25.1
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