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disp: msm: dsi: fix bl->raw_bd NULL pointer dereference

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In trusted vm, a stub function is used for the panel_ops.bl_register,
hence the backlight_device bl->raw_bd used for WLED backlight type
remains uninitialized.

If the panel backlight is WLED, this can cause a NULL pointer
dereference in TVM during dsi_panel_bl_handoff().

Add a check before dereferencing bl->raw_bd.

Change-Id: Ieb40781263b4318313fd29b339122ae6c59b1590
Signed-off-by: Rajeev Nandan <quic_rajeevny@quicinc.com>
This commit is contained in:
Rajeev Nandan
2024-05-09 01:21:04 +05:30
parent d021bca90e
commit e8c4aa25c5
1 changed files with 1 additions and 1 deletions
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2
msm/dsi/dsi_panel.c
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@@ -670,7 +670,7 @@ static u32 dsi_panel_get_brightness(struct dsi_backlight_config *bl)
switch (bl->type) { switch (bl->type) {
case DSI_BACKLIGHT_WLED: case DSI_BACKLIGHT_WLED:
/* Try to query the backlight level from the backlight device */ /* Try to query the backlight level from the backlight device */
if (bd->ops && bd->ops->get_brightness) if (bd && bd->ops && bd->ops->get_brightness)
cur_bl_level = bd->ops->get_brightness(bd); cur_bl_level = bd->ops->get_brightness(bd);
break; break;
case DSI_BACKLIGHT_DCS: case DSI_BACKLIGHT_DCS: