linux-kernel - [PATCH v2] drm/bridge: anx7625: Fix overflow issue on reading EDID

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Message-Id: <20220210103827.402436-1-treapking@chromium.org>
Date:   Thu, 10 Feb 2022 18:38:27 +0800
From:   Pin-Yen Lin <treapking@...omium.org>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Pin-Yen Lin <treapking@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Maxime Ripard <maxime@...no.tech>,
        Pi-Hsun Shih <pihsun@...omium.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Tzung-Bi Shih <tzungbi@...gle.com>,
        Xin Ji <xji@...logixsemi.com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/bridge: anx7625: Fix overflow issue on reading EDID

The length of EDID block can be longer than 256 bytes, so we should use
`int` instead of `u8` for the `edid_pos` variable.

Fixes: 8bdfc5dae4e3 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
Signed-off-by: Pin-Yen Lin <treapking@...omium.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>
---

Changes in v2:
- add "Fixes" tag
- collect review tag

 drivers/gpu/drm/bridge/analogix/anx7625.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 2346dbcc505f..e596cacce9e3 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -846,7 +846,8 @@ static int segments_edid_read(struct anx7625_data *ctx,
 static int sp_tx_edid_read(struct anx7625_data *ctx,
 			   u8 *pedid_blocks_buf)
 {
-	u8 offset, edid_pos;
+	u8 offset;
+	int edid_pos;
 	int count, blocks_num;
 	u8 pblock_buf[MAX_DPCD_BUFFER_SIZE];
 	u8 i, j;
-- 
2.35.0.263.gb82422642f-goog