[PATCH 5.10 038/152] mm/vmalloc.c: fix potential memory leak

[Greg Kroah-Hartman]

From: Miaohe Lin <linmiaohe@xxxxxxxxxx>

commit c22ee5284cf58017fa8c6d21d8f8c68159b6faab upstream.

In VM_MAP_PUT_PAGES case, we should put pages and free array in vfree.
But we missed to set area->nr_pages in vmap().  So we would fail to put
pages in __vunmap() because area->nr_pages = 0.

Link: https://lkml.kernel.org/r/20210107123541.39206-1-linmiaohe@xxxxxxxxxx
Fixes: b944afc9d64d ("mm: add a VM_MAP_PUT_PAGES flag for vmap")
Signed-off-by: Shijie Luo <luoshijie1@xxxxxxxxxx>
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 mm/vmalloc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2405,8 +2405,10 @@ void *vmap(struct page **pages, unsigned
 		return NULL;
 	}
 
-	if (flags & VM_MAP_PUT_PAGES)
+	if (flags & VM_MAP_PUT_PAGES) {
 		area->pages = pages;
+		area->nr_pages = count;
+	}
 	return area->addr;
 }
 EXPORT_SYMBOL(vmap);