riscv: Fix a number of free'd resources in init_resources()

Function init_resources() allocates a boot memory block to hold an array of
resources which it adds to iomem_resource. The array is filled in from its
end and the function then attempts to free any unused memory at the
beginning. The problem is that size of the unused memory is incorrectly
calculated and this can result in releasing memory which is in use by
active resources. Their data then gets corrupted later when the memory is
reused by a different part of the system.

Fix the size of the released memory to correctly match the number of unused
resource entries.

Fixes: ffe0e52 ("RISC-V: Improve init_resources()")
Signed-off-by: Petr Pavlu <[email protected]>
Reviewed-by: Sunil V L <[email protected]>
Acked-by: Nick Kossifidis <[email protected]>
Tested-by: Sunil V L <[email protected]>
Cc: [email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: petrpavlu

arch/riscv/kernel/setup.c

@@ -229,8 +229,8 @@ static void __init init_resources(void)
 	}
 
 	/* Clean-up any unused pre-allocated resources */
-	mem_res_sz = (num_resources - res_idx + 1) * sizeof(*mem_res);
-	memblock_free(__pa(mem_res), mem_res_sz);
+	if (res_idx >= 0)
+		memblock_free(__pa(mem_res), (res_idx + 1) * sizeof(*mem_res));
 	return;
 
  error: