From 86b2989361df6fd9bb3f46518b5326775c76358d Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Fri, 23 Mar 2018 08:23:23 -0400 Subject: [PATCH] media: uvc: to the right check at uvc_ioctl_enum_framesizes() While the logic there is correct, it tricks both humans and machines, a the check if "i" var is not zero is actually to validate if the "frames" var was initialized when the loop ran for the first time. That produces the following warning: drivers/media/usb/uvc/uvc_v4l2.c:1192 uvc_ioctl_enum_framesizes() error: potentially dereferencing uninitialized 'frame'. Change the logic to do the right test instead. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/uvc/uvc_v4l2.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 818a4369a51a..bd32914259ae 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -1173,7 +1173,7 @@ static int uvc_ioctl_enum_framesizes(struct file *file, void *fh, struct uvc_fh *handle = fh; struct uvc_streaming *stream = handle->stream; struct uvc_format *format = NULL; - struct uvc_frame *frame; + struct uvc_frame *frame = NULL; unsigned int index; unsigned int i; @@ -1189,7 +1189,7 @@ static int uvc_ioctl_enum_framesizes(struct file *file, void *fh, /* Skip duplicate frame sizes */ for (i = 0, index = 0; i < format->nframes; i++) { - if (i && frame->wWidth == format->frame[i].wWidth && + if (frame && frame->wWidth == format->frame[i].wWidth && frame->wHeight == format->frame[i].wHeight) continue; frame = &format->frame[i]; -- 2.45.2