diff options
authorDan Carpenter <dan.carpenter@oracle.com>2014-09-18 09:23:36 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2014-09-23 22:44:37 -0300
commitad3e3f0ff46765051311aa5767916a6a8e2188a2 (patch)
parent31234b45e1a132e695835add746c0e7b841bdd5a (diff)
[media] mx2-camera: potential negative underflow bug
My static checker complains: drivers/media/platform/soc_camera/mx2_camera.c:1070 mx2_emmaprp_resize() warn: no lower bound on 'num' The heuristic is that it's looking for values which the user can influence and we put an upper bound on them but we (perhaps accidentally) allow negative numbers. I am not very familiar with this code but I have looked at it and think there might be a bug. Making the variable unsigned seems like a safe option either way and this silences the static checker warning. The call tree is: -> subdev_do_ioctl() -> mx2_camera_set_fmt() -> mx2_emmaprp_resize() The check: if (num > RESIZE_NUM_MAX) can underflow and then we use "num" on the else path. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/platform/soc_camera/mx2_camera.c b/drivers/media/platform/soc_camera/mx2_camera.c
index 2d57c1d272b8..2347612a4cc1 100644
--- a/drivers/media/platform/soc_camera/mx2_camera.c
+++ b/drivers/media/platform/soc_camera/mx2_camera.c
@@ -1002,7 +1002,7 @@ static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
struct v4l2_mbus_framefmt *mf_in,
struct v4l2_pix_format *pix_out, bool apply)
- int num, den;
+ unsigned int num, den;
unsigned long m;
int i, dir;

Privacy Policy