4.9-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
[ Upstream commit cd0e0ca69109d025b1a1b6609f70682db62138b0 ]
The ARRAY_SIZE() macro is type size_t. If s6e8aa0_dcs_read() returns a negative error code, then "ret < ARRAY_SIZE(id)" is false because the negative error code is type promoted to a high positive value.
Fixes: 02051ca06371 ("drm/panel: add S6E8AA0 driver") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Reviewed-by: Andrzej Hajda a.hajda@samsung.com Signed-off-by: Thierry Reding treding@nvidia.com Link: https://patchwork.freedesktop.org/patch/msgid/20180704093807.s3lqsb2v6dg2k43... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c @@ -823,7 +823,7 @@ static void s6e8aa0_read_mtp_id(struct s int ret, i;
ret = s6e8aa0_dcs_read(ctx, 0xd1, id, ARRAY_SIZE(id)); - if (ret < ARRAY_SIZE(id) || id[0] == 0x00) { + if (ret < 0 || ret < ARRAY_SIZE(id) || id[0] == 0x00) { dev_err(ctx->dev, "read id failed\n"); ctx->error = -EIO; return;