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drm/panel: ilitek-ili9881c: fix attach failure cleanup

Message ID 20201230204110.52053-1-icenowy@aosc.io (mailing list archive)
State New, archived
Headers show
Series drm/panel: ilitek-ili9881c: fix attach failure cleanup | expand

Commit Message

Icenowy Zheng Dec. 30, 2020, 8:41 p.m. UTC 
When mipi_dsi_attach() fails (e.g. got a -EPROBE_DEFER), the panel should
be removed, otherwise a pointer to it will be kept and then lead to
use-after-free when DRM panel codes are called (e.g. the panel is probed
again).

Fix this by adding cleanup code after mipi_dsi_attach() failure.

Fixes: 26aec25593c2 ("drm/panel: Add Ilitek ILI9881c panel driver")
Cc: stable@vger.kernel.org
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index 0145129d7c66..22f2268f00f7 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -674,7 +674,13 @@  static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 	dsi->format = MIPI_DSI_FMT_RGB888;
 	dsi->lanes = 4;
 
-	return mipi_dsi_attach(dsi);
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return ret;
+	}
+
+	return 0;
 }
 
 static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi)