Commit 2f359aea authored Oct 12, 2021 by Neil Armstrong Committed by Anas Nashif Oct 13, 2021

mmu: fix virt_region_alloc() unused region free when aligned



In the case where the aligned memory range is on top of the allocated
memory range, freeing the 0 sized top unused memory will trigger
an assert in the virt_region_free() call since vaddr could be equal
to Z_VIRT_REGION_END_ADDR.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

parent 513d691d

kernel/mmu.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -313,8 +313,10 @@ static void *virt_region_alloc(size_t size, size_t align)
		/* Free the two unused regions */
		virt_region_free(UINT_TO_POINTER(dest_addr),
		aligned_dest_addr - dest_addr);
		if (((dest_addr + alloc_size) - (aligned_dest_addr + size)) > 0) {
		virt_region_free(UINT_TO_POINTER(aligned_dest_addr + size),
		(dest_addr + alloc_size) - (aligned_dest_addr + size));
		}

		dest_addr = aligned_dest_addr;
		}

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