Re: [PATCH 5.15.y] iio: adc: rockchip_saradc: fix information leak in triggered buffer

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

The upstream commit SHA1 provided is correct: 38724591364e1e3b278b4053f102b49ea06ee17c

WARNING: Author mismatch between patch and upstream commit:
Backport author: lanbincn@qq.com
Commit author: Javier Carrasco<javier.carrasco.cruz@gmail.com>


Status in newer kernel trees:
6.12.y | Present (different SHA1: 4291becc8b99)
6.6.y | Present (different SHA1: 0b5e30f0aceb)
6.1.y | Not found
5.15.y | Not found

Note: The patch differs from the upstream commit:
---
1:  38724591364e ! 1:  bc61bac32997 iio: adc: rockchip_saradc: fix information leak in triggered buffer
    @@ Metadata
      ## Commit message ##
         iio: adc: rockchip_saradc: fix information leak in triggered buffer
     
    +    commit 38724591364e1e3b278b4053f102b49ea06ee17c upstream.
    +
         The 'data' local struct is used to push data to user space from a
         triggered buffer, but it does not set values for inactive channels, as
         it only uses iio_for_each_active_channel() to assign new values.
    @@ Commit message
         Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
         Link: https://patch.msgid.link/20241125-iio_memset_scan_holes-v1-4-0cb6e98d895c@gmail.com
         Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    +    (cherry picked from commit 38724591364e1e3b278b4053f102b49ea06ee17c)
    +    Signed-off-by: Bin Lan <lanbincn@qq.com>
     
      ## drivers/iio/adc/rockchip_saradc.c ##
     @@ drivers/iio/adc/rockchip_saradc.c: static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
    @@ drivers/iio/adc/rockchip_saradc.c: static irqreturn_t rockchip_saradc_trigger_ha
      
     +	memset(&data, 0, sizeof(data));
     +
    - 	mutex_lock(&info->lock);
    + 	mutex_lock(&i_dev->mlock);
      
    - 	iio_for_each_active_channel(i_dev, i) {
    + 	for_each_set_bit(i, i_dev->active_scan_mask, i_dev->masklength) {
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.15.y       |  Success    |  Success   |