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: ffe0e5261268 ("RISC-V: Improve init_resources()")
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Nick Kossifidis <mick@ics.forth.gr>
Tested-by: Sunil V L <sunilvl@ventanamicro.com>
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 18bd0e4bc36cf2905f8e9652fca076c8202062fe..120b2f6f71bc097362c97ed4081eee4bc2575683 100644 (file)
--- a/arch/riscv/kernel/setup.c
+++ b/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: