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drm/bridge/sii8620: Fix memory corruption

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Function sii8620_mt_read_devcap_reg_recv() used to read array index
from a wrong msg register, which caused writing out of array
bounds. It led to writing on other fields of struct sii8620.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
Fixes: e9c6da270 ("drm/bridge/sii8620: add reading device capability
       registers")
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1503311571-25819-1-git-send-email-m.purski@samsung.com
This commit is contained in:
Maciej Purski 2017-08-21 12:32:51 +02:00 committed by Andrzej Hajda
parent fe4600a548
commit 79964dbaf6
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/bridge/sil-sii8620.c
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@ -597,9 +597,9 @@ static void sii8620_mt_read_devcap(struct sii8620 *ctx, bool xdevcap)
static void sii8620_mt_read_devcap_reg_recv(struct sii8620 *ctx,
struct sii8620_mt_msg *msg)
{
u8 reg = msg->reg[0] & 0x7f;
u8 reg = msg->reg[1] & 0x7f;
if (msg->reg[0] & 0x80)
if (msg->reg[1] & 0x80)
ctx->xdevcap[reg] = msg->ret;
else
ctx->devcap[reg] = msg->ret;