From: Chandra Mohan Sundar Date: Mon, 18 Aug 2025 09:31:57 +0000 (+0530) Subject: media: stm32-csi: Fix dereference before NULL check X-Git-Tag: v6.18-rc1~133^2~259 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=80eaf32672871bd2623ce6ba13ffc1f018756580;p=thirdparty%2Flinux.git media: stm32-csi: Fix dereference before NULL check 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 Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/platform/st/stm32/stm32-csi.c b/drivers/media/platform/st/stm32/stm32-csi.c index b69048144cc12..fd2b6dfbd44c5 100644 --- 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(struct stm32_csi_dev *csidev, 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_csi_dev *csidev, 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)