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Subject: [media] zr364xx: enforce minimum size when reading header
Author: Alyssa Milburn <amilburn@xxxxxxxx>
Date: Sat Apr 1 14:34:08 2017 -0300
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@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
drivers/media/usb/zr364xx/zr364xx.c | 8 ++++++++
1 file changed, 8 insertions(+)
---
diff --git a/drivers/media/usb/zr364xx/zr364xx.c b/drivers/media/usb/zr364xx/zr364xx.c
index f2d6fc03dda0..efdcd5bd6a4c 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -600,6 +600,14 @@ static int zr364xx_read_video_callback(struct zr364xx_camera *cam,
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;