From: Alexander Stein <alexander.stein@ew.tq-group.com>
To: Marek Vasut <marex@denx.de>, Stefan Agner <stefan@agner.ch>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>
Cc: Alexander Stein <alexander.stein@ew.tq-group.com>,
linux-arm-kernel@lists.infradead.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH 1/1] drm: mxsfb: Fix NULL pointer dereference
Date: Fri, 21 Jan 2022 14:12:38 +0100 [thread overview]
Message-ID: <20220121131238.507567-1-alexander.stein@ew.tq-group.com> (raw)
Do not deference the NULL pointer if the bridge does not return a
bridge state. Assume a fixed format instead.
Fixes: commit b776b0f00f24 ("drm: mxsfb: Use bus_format from the nearest bridge if present")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
This can happen if a "ti,sn75lvds83", "lvds-encoder" bridge is attached
to it. atomic_get_input_bus_fmts is only implemented for the
lvds-decoder case.
drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index 0655582ae8ed..4cfb6c001679 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -361,7 +361,11 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
bridge_state =
drm_atomic_get_new_bridge_state(state,
mxsfb->bridge);
- bus_format = bridge_state->input_bus_cfg.format;
+ if (!bridge_state)
+ bus_format = MEDIA_BUS_FMT_FIXED;
+ else
+ bus_format = bridge_state->input_bus_cfg.format;
+
if (bus_format == MEDIA_BUS_FMT_FIXED) {
dev_warn_once(drm->dev,
"Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
--
2.25.1
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next reply other threads:[~2022-01-21 13:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-21 13:12 Alexander Stein [this message]
2022-01-21 13:14 ` [PATCH 1/1] drm: mxsfb: Fix NULL pointer dereference Marek Vasut
2022-01-21 13:24 ` (EXT) " Alexander Stein
2022-01-21 13:28 ` Marek Vasut
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