2022-12-16 08:55:34

by Ming Qian

[permalink] [raw]
Subject: [PATCH] media: v4l2-jpeg: correct the skip count in jpeg_parse_app14_data

The curr pointer has advanced 14 bytes in jpeg_parse_app14_data.
1. jpeg_get_word_be(stream), it goes forward 2 bytes.
2. jpeg_skip(stream, 11), it goes forward 11 bytes.
3. jpeg_get_byte(stream), it goes forward 1 bytes.

so the remain bytes of this segment should be (lp - 2 - 11 - 1),
but not (lp - 2 - 11).

if driver skip 1 extra bytes, the following parsing may go wrong.

Fixes: b8035f7988a8 ("media: Add parsing for APP14 data segment in jpeg helpers")
Signed-off-by: Ming Qian <[email protected]>
---
drivers/media/v4l2-core/v4l2-jpeg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-jpeg.c b/drivers/media/v4l2-core/v4l2-jpeg.c
index c2513b775f6a..75c2af763d55 100644
--- a/drivers/media/v4l2-core/v4l2-jpeg.c
+++ b/drivers/media/v4l2-core/v4l2-jpeg.c
@@ -474,7 +474,7 @@ static int jpeg_parse_app14_data(struct jpeg_stream *stream,
*tf = ret;

/* skip the rest of the segment, this ensures at least it is complete */
- skip = lp - 2 - 11;
+ skip = lp - 2 - 11 - 1;
return jpeg_skip(stream, skip);
}

--
2.38.1