| From | Ben Hutchings <> | Date | Fri, 18 Aug 2017 14:13:20 +0100 | Subject | [PATCH 3.16 055/134] [media] zr364xx: enforce minimum size when reading header |
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3.16.47-rc1 review patch. If anyone has any objections, please let me know.
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From: Alyssa Milburn <amilburn@zall.org>
commit ee0fe833d96793853335844b6d99fb76bd12cbeb upstream.
This code copies actual_length-128 bytes from the header, which will underflow if the received buffer is too small.
Signed-off-by: Alyssa Milburn <amilburn@zall.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/media/usb/zr364xx/zr364xx.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/drivers/media/usb/zr364xx/zr364xx.c +++ b/drivers/media/usb/zr364xx/zr364xx.c @@ -605,6 +605,14 @@ static int zr364xx_read_video_callback(s ptr = pdest = frm->lpvbits; if (frm->ulState == ZR364XX_READ_IDLE) { + if (purb->actual_length < 128) { + /* header incomplete */ + dev_info(&cam->udev->dev, + "%s: buffer (%d bytes) too small to hold jpeg header. Discarding.\n", + __func__, purb->actual_length); + return -EINVAL; + } + frm->ulState = ZR364XX_READ_FRAME; frm->cur_size = 0;
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