1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index e06cde093f76..9ab18995ff1e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4404,8 +4404,13 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, int cpu, void *data)
 {
         struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
         struct buffer_data_page *bpage = data;
+        struct page *page = virt_to_page(bpage);
         unsigned long flags;
 
+        /* If the page is still in use someplace else, we can't reuse it */
+        if (page_ref_count(page) > 1)
+                goto out;
+
         local_irq_save(flags);
         arch_spin_lock(&cpu_buffer->lock);
 
@@ -4417,6 +4422,7 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, int cpu, void *data)
         arch_spin_unlock(&cpu_buffer->lock);
         local_irq_restore(flags);
 
+ out:
         free_page((unsigned long)bpage);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_free_read_page);