arm64: perf: Don't use of_node after putting it

It's possible, albeit unlikely, that using the of_node here will
reference freed memory. Call of_node_put() after printing the
name to be safe.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 702591f6180a8d50704648977ff48e4f6811880d..8af7784a8e3505d49d62b9c626c493dbdf7b280d 100644 (file)
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1340,12 +1340,13 @@ static int armpmu_device_probe(struct platform_device *pdev)
                        if (arch_find_n_match_cpu_physical_id(dn, cpu, NULL))
                                break;
 
-               of_node_put(dn);
                if (cpu >= nr_cpu_ids) {
                        pr_warn("Failed to find logical CPU for %s\n",
                                dn->name);
+                       of_node_put(dn);
                        break;
                }
+               of_node_put(dn);
 
                irqs[i] = cpu;
        }