Re: [PATCH] devm_memremap_release: fix memremap'd addr handling
On Tue, 16 Feb 2016 09:30:27 -0700 Toshi Kani <toshi.kani(a)hpe.com> wrote:
The pmem driver calls devm_memremap() to map a persistent memory
range. When the pmem driver is unloaded, this memremap'd range
is not released.
Fix devm_memremap_release() to handle a given memremap'd address
properly.
...
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -114,7 +114,7 @@ EXPORT_SYMBOL(memunmap);
static void devm_memremap_release(struct device *dev, void *res)
{
- memunmap(res);
+ memunmap(*(void **)res);
}
Huh. So what happens? memunmap() decides it isn't a vmalloc address
and we leak a vma?
I'll add a cc:stable to this.