tracing: Remove extra zeroing out of the ring buffer page

commit 6b7e633fe9c24682df550e5311f47fb524701586 upstream.

The ring_buffer_read_page() takes care of zeroing out any extra data in the
page that it returns. There's no need to zero it out again from the
consumer. It was removed from one consumer of this function, but
read_buffers_splice_read() did not remove it, and worse, it contained a
nasty bug because of it.

Fixes: 2711ca237a084 ("ring-buffer: Move zeroing out excess in page to ring buffer code")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e61b862309afed2677429788ef2381254527773d..10286ffd91121f6eccfdd59082bd6255eb5b025e 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5502,7 +5502,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                .spd_release    = buffer_spd_release,
        };
        struct buffer_ref *ref;
-       int entries, size, i;
+       int entries, i;
        ssize_t ret = 0;
 
        mutex_lock(&trace_types_lock);
@@ -5563,14 +5563,6 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                        break;
                }
 
-               /*
-                * zero out any left over data, this is going to
-                * user land.
-                */
-               size = ring_buffer_page_len(ref->page);
-               if (size < PAGE_SIZE)
-                       memset(ref->page + size, 0, PAGE_SIZE - size);
-
                page = virt_to_page(ref->page);
 
                spd.pages[i] = page;