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drm/bridge: anx7625: Fix overflow issue on reading EDID

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[ 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>
This commit is contained in:
Pin-Yen Lin 2022-02-10 18:38:27 +08:00 committed by Greg Kroah-Hartman
parent d6c7f46b8f
commit 64c06df242
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/bridge/analogix/anx7625.c
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@ -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;