Messages in this thread Patch in this message | | | From | Liviu Dudau <> | Subject | [PATCH] mm/vmalloc.c: don't dereference possible NULL pointer in __vunmap. | Date | Fri, 28 Dec 2018 17:10:09 +0000 |
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find_vmap_area() can return a NULL pointer and we're going to dereference it without checking it first. Use the existing find_vm_area() function which does exactly what we want and checks for the NULL pointer.
Fixes: f3c01d2f3ade ("mm: vmalloc: avoid racy handling of debugobjects in vunmap")
Signed-off-by: Liviu Dudau <liviu@dudau.co.uk> --- mm/vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 871e41c55e239..806047d7fda3c 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1505,7 +1505,7 @@ static void __vunmap(const void *addr, int deallocate_pages) addr)) return; - area = find_vmap_area((unsigned long)addr)->vm; + area = find_vm_area(addr); if (unlikely(!area)) { WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n", addr); -- 2.20.1
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