media: ov7740: avoid invalid framesize setting

[ Upstream commit 6e4ab830ac6d6a0d7cd7f87dc5d6536369bf24a8 ]

If the requested framesize by VIDIOC_SUBDEV_S_FMT is larger than supported
framesizes, it causes an out of bounds array access and the resulting
framesize is unexpected.

Avoid out of bounds array access and select the default framesize.

Cc: Wenyou Yang <wenyou.yang@microchip.com>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/i2c/ov7740.c b/drivers/media/i2c/ov7740.c
index dfece91ce96be4f178dab3bdadbf334bb0b410fe..8207e7cf9923cb2089a2bd6f077f8436f5dd2b24 100644 (file)
--- a/drivers/media/i2c/ov7740.c
+++ b/drivers/media/i2c/ov7740.c
@@ -761,7 +761,11 @@ static int ov7740_try_fmt_internal(struct v4l2_subdev *sd,
 
                fsize++;
        }
-
+       if (i >= ARRAY_SIZE(ov7740_framesizes)) {
+               fsize = &ov7740_framesizes[0];
+               fmt->width = fsize->width;
+               fmt->height = fsize->height;
+       }
        if (ret_frmsize != NULL)
                *ret_frmsize = fsize;