[PATCH v9 4/8] media: Quit parsing stream if doesn't start with SOI

["Mirela Rabulea (OSS)" <mirela.rabulea@oss.nxp.com>]

From: Mirela Rabulea <mirela.rabulea@nxp.com>

In the case we get an invalid stream, such as from v4l2-compliance
streaming test, jpeg_next_marker will end up parsing the entire
stream. The standard describes the high level syntax of a jpeg
as starting with SOI, ending with EOI, so return error if the very
first 2 bytes are not SOI.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/v4l2-core/v4l2-jpeg.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-jpeg.c b/drivers/media/v4l2-core/v4l2-jpeg.c
index ede40f2a5456..c4c0d6dd4577 100644
--- a/drivers/media/v4l2-core/v4l2-jpeg.c
+++ b/drivers/media/v4l2-core/v4l2-jpeg.c
@@ -503,11 +503,8 @@ int v4l2_jpeg_parse_header(void *buf, size_t len, struct v4l2_jpeg_header *out)
 	out->num_dht = 0;
 	out->num_dqt = 0;
 
-	/* the first marker must be SOI */
-	marker = jpeg_next_marker(&stream);
-	if (marker < 0)
-		return marker;
-	if (marker != SOI)
+	/* the first bytes must be SOI, B.2.1 High-level syntax */
+	if (jpeg_get_word_be(&stream) != SOI)
 		return -EINVAL;
 
 	/* init value to signal if this marker is not present */
-- 
2.17.1