| From | Ben Hutchings <> | Date | Sun, 09 Dec 2018 21:50:33 +0000 | Subject | [PATCH 3.16 035/328] drm/panel: type promotion bug in s6e8aa0_read_mtp_id() |
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3.16.62-rc1 review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter <dan.carpenter@oracle.com>
commit cd0e0ca69109d025b1a1b6609f70682db62138b0 upstream.
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.s3lqsb2v6dg2k43d@kili.mountain [bwh: Backported to 3.16: adjust filename] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/gpu/drm/panel/panel-s6e8aa0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/panel/panel-s6e8aa0.c +++ b/drivers/gpu/drm/panel/panel-s6e8aa0.c @@ -832,7 +832,7 @@ 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;
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