mm/vmalloc.c: don't dereference possible NULL pointer in __vunmap()
commit6ade20327d
upstream. 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. Link: http://lkml.kernel.org/r/20181228171009.22269-1-liviu@dudau.co.uk Fixes:f3c01d2f3a
("mm: vmalloc: avoid racy handling of debugobjects in vunmap") Signed-off-by: Liviu Dudau <liviu@dudau.co.uk> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Chintan Pandya <cpandya@codeaurora.org> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
fba023f8dd
commit
d20b134f68
|
@ -1499,7 +1499,7 @@ 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);
|
||||
|
|
Loading…
Reference in New Issue