From 728385c4d31469b9124953f36fb42015435466c9 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 12 Mar 2010 06:15:32 -0300 Subject: V4L/DVB: drivers/media/video: move dereference after NULL test In quickcam_messenger.c, if the NULL test on uvd is needed, then the dereference should be after the NULL test. In vpif_display.c, std_info is initialized to the address of a structure field. This seems unlikely to be NULL. Test std_info->stdid instead. In saa7134-alsa.c, the function is only called from one place, where the chip argument has already been dereferenced. On the other hand, if it should be kept, then card should be initialized after it. A simplified version of the semantic match that detects this problem is as follows (http://coccinelle.lip6.fr/): // @match exists@ expression x, E; identifier fld; @@ * x->fld ... when != \(x = E\|&x\) * x == NULL // Signed-off-by: Julia Lawall Acked-by: Muralidharan Karicheri Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/usbvideo/quickcam_messenger.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/media/video/usbvideo/quickcam_messenger.c') diff --git a/drivers/media/video/usbvideo/quickcam_messenger.c b/drivers/media/video/usbvideo/quickcam_messenger.c index fab48ec6c0ea..fbd665fa1979 100644 --- a/drivers/media/video/usbvideo/quickcam_messenger.c +++ b/drivers/media/video/usbvideo/quickcam_messenger.c @@ -693,12 +693,13 @@ static int qcm_start_data(struct uvd *uvd) static void qcm_stop_data(struct uvd *uvd) { - struct qcm *cam = (struct qcm *) uvd->user_data; + struct qcm *cam; int i, j; int ret; if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL)) return; + cam = (struct qcm *) uvd->user_data; ret = qcm_camera_off(uvd); if (ret) -- cgit v1.2.3