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powerpc/kasan: Fix error detection on memory allocation 

In case (k_start & PAGE_MASK) doesn't equal (kstart), 'va' will never be
NULL allthough 'block' is NULL

Check the return of memblock_alloc() directly instead of
the resulting address in the loop.

Fixes: 509cd3f2b4 ("powerpc/32: Simplify KASAN init")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7cb8ca82042bfc45a5cfe726c921cd7e7eeb12a3.1589866984.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-19 05:48:43 +00:00 committed by Michael Ellerman
parent 30df74d67d
commit d132443a73
1 changed files with 2 additions and 3 deletions
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5
arch/powerpc/mm/kasan/kasan_init_32.c
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@ -76,15 +76,14 @@ static int __init kasan_init_region(void *start, size_t size)
return ret;
block = memblock_alloc(k_end - k_start, PAGE_SIZE);
if (!block)
return -ENOMEM;
for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_ptr_k(k_cur);
void *va = block + k_cur - k_start;
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
if (!va)
return -ENOMEM;
__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
}
flush_tlb_kernel_range(k_start, k_end);