4.17-stable review patch. If anyone has any objections, please let me know.
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From: Mauro Carvalho Chehab mchehab@s-opensource.com
commit ea72fbf588ac9c017224dcdaa2019ff52ca56fee upstream.
As warned by smatch: drivers/media/v4l2-core/v4l2-compat-ioctl32.c:879 put_v4l2_ext_controls32() warn: check for integer overflow 'count'
The access_ok() logic should check for too big arrays too.
Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -871,7 +871,7 @@ static int put_v4l2_ext_controls32(struc get_user(kcontrols, &kp->controls)) return -EFAULT;
- if (!count) + if (!count || count > (U32_MAX/sizeof(*ucontrols))) return 0; if (get_user(p, &up->controls)) return -EFAULT;