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mm/vmalloc.c: fix potential memory leak 

commit c22ee5284c 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@huawei.com
Fixes: b944afc9d6 ("mm: add a VM_MAP_PUT_PAGES flag for vmap")
Signed-off-by: Shijie Luo <luoshijie1@huawei.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/224/head^2
Miaohe Lin 2021-01-12 15:49:18 -08:00 committed by Greg Kroah-Hartman
parent 33dbd5422c
commit b4ecc25965
1 changed files with 3 additions and 1 deletions
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mm/vmalloc.c
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@ -2405,8 +2405,10 @@ void *vmap(struct page **pages, unsigned int count,
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);