On Fri May 8 11:59:03 2026 +0200, Martin Hecht wrote:
> The current implementation of alvium_ctrl_init creates several controls in
> function alvium_ctrl_init and uses the returned pointer without check. That
> can cause write access over NULL-pointer for several controls. The reworked
> code checks the pointers before adding flags.
>
> Fixes: 0a7af872915e ("media: i2c: Add support for alvium camera")
> Cc: [email protected]
> Signed-off-by: Martin Hecht <[email protected]>
> Signed-off-by: Sakari Ailus <[email protected]>
Patch committed.
Thanks,
Sakari Ailus
drivers/media/i2c/alvium-csi2.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
---
diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index 955b7072a560..dd991c2ee700 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -2100,20 +2100,21 @@ static int alvium_ctrl_init(struct alvium_dev *alvium)
V4L2_CID_PIXEL_RATE, 0,
ALVIUM_DEFAULT_PIXEL_RATE_MHZ, 1,
ALVIUM_DEFAULT_PIXEL_RATE_MHZ);
- ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
/* Link freq is fixed */
ctrls->link_freq = v4l2_ctrl_new_int_menu(hdl, ops,
V4L2_CID_LINK_FREQ,
0, 0, &alvium->link_freq);
- ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+ if (ctrls->link_freq)
+ ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
/* Auto/manual white balance */
if (alvium->avail_ft.auto_whiteb) {
ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_AUTO_WHITE_BALANCE,
0, 1, 1, 1);
- v4l2_ctrl_auto_cluster(3, &ctrls->auto_wb, 0, false);
+ if (ctrls->auto_wb)
+ v4l2_ctrl_auto_cluster(3, &ctrls->auto_wb, 0, false);
}
ctrls->blue_balance = v4l2_ctrl_new_std(hdl, ops,
@@ -2122,6 +2123,7 @@ static int alvium_ctrl_init(struct alvium_dev *alvium)
alvium->max_bbalance,
alvium->inc_bbalance,
alvium->dft_bbalance);
+
ctrls->red_balance = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_RED_BALANCE,
alvium->min_rbalance,
@@ -2136,7 +2138,9 @@ static int alvium_ctrl_init(struct alvium_dev *alvium)
V4L2_CID_EXPOSURE_AUTO,
V4L2_EXPOSURE_MANUAL, 0,
V4L2_EXPOSURE_AUTO);
- v4l2_ctrl_auto_cluster(2, &ctrls->auto_exp, 1, true);
+ if (ctrls->auto_exp)
+ v4l2_ctrl_auto_cluster(2, &ctrls->auto_exp,
+ V4L2_EXPOSURE_MANUAL, true);
}
ctrls->exposure = v4l2_ctrl_new_std(hdl, ops,
@@ -2145,14 +2149,16 @@ static int alvium_ctrl_init(struct alvium_dev *alvium)
alvium->max_exp,
alvium->inc_exp,
alvium->dft_exp);
- ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ if (ctrls->exposure)
+ ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
/* Auto/manual gain */
if (alvium->avail_ft.auto_gain) {
ctrls->auto_gain = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_AUTOGAIN,
0, 1, 1, 1);
- v4l2_ctrl_auto_cluster(2, &ctrls->auto_gain, 0, true);
+ if (ctrls->auto_gain)
+ v4l2_ctrl_auto_cluster(2, &ctrls->auto_gain, 0, true);
}
if (alvium->avail_ft.gain) {
@@ -2162,7 +2168,8 @@ static int alvium_ctrl_init(struct alvium_dev *alvium)
alvium->max_gain,
alvium->inc_gain,
alvium->dft_gain);
- ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ if (ctrls->gain)
+ ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
}
if (alvium->avail_ft.sat)
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