[PATCH 5.16 0835/1017] media: imx-jpeg: fix a bug of accessing array out of bounds

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 09:37:41 EST

From: Ming Qian <ming.qian@xxxxxxx>

[ Upstream commit 97558d170a1236280407e8d29a7d095d2c2ed554 ]

When error occurs in parsing jpeg, the slot isn't acquired yet, it may
be the default value MXC_MAX_SLOTS.
If the driver access the slot using the incorrect slot number, it will
access array out of bounds.
The result is the driver will change num_domains, which follows
slot_data in struct mxc_jpeg_dev.
Then the driver won't detach the pm domain at rmmod, which will lead to
kernel panic when trying to insmod again.

Signed-off-by: Ming Qian <ming.qian@xxxxxxx>
Reviewed-by: Mirela Rabulea <mirela.rabulea@xxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/media/platform/imx-jpeg/mxc-jpeg.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
index b249c1bbfac8..83a2b4d13bad 100644
--- a/drivers/media/platform/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
@@ -954,7 +954,6 @@ static void mxc_jpeg_device_run(void *priv)
jpeg_src_buf->jpeg_parse_error = true;
if (jpeg_src_buf->jpeg_parse_error) {
- jpeg->slot_data[ctx->slot].used = false;
v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);