[v1] media: imx-jpeg: fix a bug of accessing array out of bounds

Commit Message

Ming Qian Feb. 7, 2022, 6:28 a.m. UTC

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 <[e-mail]>
Reviewed-by: Mirela Rabulea <[e-mail]>
---
 drivers/media/platform/imx-jpeg/mxc-jpeg.c | 1 -
 1 file changed, 1 deletion(-)

Patch

diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
index 7c0366f5f801..86d37d14cfe2 100644
--- a/drivers/media/platform/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
@@ -948,7 +948,6 @@  static void mxc_jpeg_device_run(void *priv)
 
 	jpeg_src_buf = vb2_to_mxc_buf(&src_buf->vb2_buf);
 	if (jpeg_src_buf->jpeg_parse_error) {
-		jpeg->slot_data[ctx->slot].used = false;
 		v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
 		v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
 		v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);