[PATCH 5.16 0498/1017] drm/bridge: anx7625: Fix overflow issue on reading EDID

Greg Kroah-Hartman
2022-04-05T09:50:59Z

From: Pin-Yen Lin <treapking@chromium.org>

[ Upstream commit d5c6f647aec9ed524aedd04a3aec5ebc21d39007 ]

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@chromium.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220210103827.402436-1-treapking@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 1a871f6b6822..9b2421040926 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -791,7 +791,8 @@ 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;
--
2.34.1