V4L/DVB (6751): V4L: Memory leak! Fix count in videobuf-vmalloc mmap

This is pretty serious bug.  map->count is never initialized after the
call to kmalloc making the count start at some random trash value.  The
end result is leaking videobufs.

Also, fix up the debug statements to print unsigned values.

Pushed to http://ifup.org/hg/v4l-dvb too

Signed-off-by: Brandon Philips <bphilips@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/videobuf-vmalloc.c b/drivers/media/video/videobuf-vmalloc.c
index cd74341..e012594 100644 (file)
--- a/drivers/media/video/videobuf-vmalloc.c
+++ b/drivers/media/video/videobuf-vmalloc.c
@@ -51,7 +51,7 @@ videobuf_vm_open(struct vm_area_struct *vma)
 {
        struct videobuf_mapping *map = vma->vm_private_data;
 
-       dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
+       dprintk(2,"vm_open %p [count=%u,vma=%08lx-%08lx]\n",map,
                map->count,vma->vm_start,vma->vm_end);
 
        map->count++;
@@ -64,7 +64,7 @@ videobuf_vm_close(struct vm_area_struct *vma)
        struct videobuf_queue *q = map->q;
        int i;
 
-       dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
+       dprintk(2,"vm_close %p [count=%u,vma=%08lx-%08lx]\n",map,
                map->count,vma->vm_start,vma->vm_end);
 
        map->count--;
@@ -221,7 +221,7 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
        }
 
        /* create mapping + update buffer list */
-       map = q->bufs[first]->map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
+       map = q->bufs[first]->map = kzalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
        if (NULL == map)
                return -ENOMEM;