Re: [syzbot] [trace?] WARNING in tracing_buffers_mmap_close (3)

[Qing Wang]

#syz test

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 23de3719f495..c74ba9c8c98e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8251,12 +8251,14 @@ static int tracing_buffers_mmap(struct file *filp, 
struct vm_area_struct *vma)
                return ret;
 
        ret = ring_buffer_map(iter->array_buffer->buffer, iter->cpu_file, vma);
-       if (ret)
+       if (ret) {
                put_snapshot_map(iter->tr);
+               return ret;
+       }
 
        vma->vm_ops = &tracing_buffers_vmops;
 
-       return ret;
+       return 0;
 }
 
 static const struct file_operations tracing_buffers_fops = {