From: Márton Németh Date: Wed, 15 Apr 2009 12:01:58 +0000 (-0300) Subject: V4L/DVB (11573): uvcvideo: Prevent invormation loss with removing implicit casting X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9086c7b994dcd6d06723bcb48a23af3e3f75e002;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git V4L/DVB (11573): uvcvideo: Prevent invormation loss with removing implicit casting The uvcvideo driver supports only one input, which is input 0. For all other input index the return value shall be EINVAL. This patch fixes the problem when the value 0x80000000 was incorrectly casted and treated as a zero value. The patch was tested with v4l-test 0.10 [2] with CNF7129 webcam found on EeePC 901. References: [1] V4L2 API specification, revision 0.24 http://v4l2spec.bytesex.org/spec/r11217.htm [2] v4l-test: Test environment for Video For Linux Two API http://v4l-test.sourceforge.net/ [Modified by Laurent Pinchart] Invalid input value (u32)-1 would be accepted due to integer overflow. Make sure the driver rejects it and returns -EINVAL. Signed-off-by: Márton Németh Signed-off-by: Andrew Morton Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c index 2a80caa54fb4..43b05a7ecdce 100644 --- a/drivers/media/video/uvc/uvc_v4l2.c +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -648,7 +648,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) case VIDIOC_S_INPUT: { - u8 input = *(u32 *)arg + 1; + u32 input = *(u32 *)arg + 1; if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; @@ -660,7 +660,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) break; } - if (input > video->selector->selector.bNrInPins) + if (input == 0 || input > video->selector->selector.bNrInPins) return -EINVAL; return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,