[v4,5/8] RISC-V: Compare cpuid with NR_CPUS before mapping.

Commit Message

Atish Patra Feb. 12, 2019, 11:10 a.m. UTC

We should never have a cpuid greater that NR_CPUS. Compare with NR_CPUS
before creating the mapping between logical and physical CPU ids. This
is also mandatory as NR_CPUS check is removed from
riscv_of_processor_hartid.

Signed-off-by: Atish Patra <[e-mail]>
Reviewed-by: Anup Patel <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 arch/riscv/kernel/smpboot.c | 5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index d369b669..eb533b5c 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -66,6 +66,11 @@  void __init setup_smp(void)
 			found_boot_cpu = 1;
 			continue;
 		}
+		if (cpuid >= NR_CPUS) {
+			pr_warn("Invalid cpuid [%d] for hartid [%d]\n",
+				cpuid, hart);
+			break;
+		}
 
 		cpuid_to_hartid_map(cpuid) = hart;
 		set_cpu_possible(cpuid, true);