6.16-stable review patch. If anyone has any objections, please let me know.
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From: Chandra Mohan Sundar chandramohan.explore@gmail.com
commit 80eaf32672871bd2623ce6ba13ffc1f018756580 upstream.
In 'stm32_csi_start', 'csidev->s_subdev' is dereferenced directly while assigning a value to the 'src_pad'. However the same value is being checked against NULL at a later point of time indicating that there are chances that the value can be NULL.
Move the dereference after the NULL check.
Fixes: e7bad98c205d1 ("media: v4l: Convert the users of v4l2_get_link_freq to call it on a pad") Cc: stable@vger.kernel.org Signed-off-by: Chandra Mohan Sundar chandramohan.explore@gmail.com Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil+cisco@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/platform/st/stm32/stm32-csi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/media/platform/st/stm32/stm32-csi.c +++ b/drivers/media/platform/st/stm32/stm32-csi.c @@ -443,8 +443,7 @@ static void stm32_csi_phy_reg_write(stru static int stm32_csi_start(struct stm32_csi_dev *csidev, struct v4l2_subdev_state *state) { - struct media_pad *src_pad = - &csidev->s_subdev->entity.pads[csidev->s_subdev_pad_nb]; + struct media_pad *src_pad; const struct stm32_csi_mbps_phy_reg *phy_regs = NULL; struct v4l2_mbus_framefmt *sink_fmt; const struct stm32_csi_fmts *fmt; @@ -466,6 +465,7 @@ static int stm32_csi_start(struct stm32_ if (!csidev->s_subdev) return -EIO;
+ src_pad = &csidev->s_subdev->entity.pads[csidev->s_subdev_pad_nb]; link_freq = v4l2_get_link_freq(src_pad, fmt->bpp, 2 * csidev->num_lanes); if (link_freq < 0)