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authorAl Viro <viro@zeniv.linux.org.uk>2016-09-17 18:31:46 -0400
committerSteven Rostedt <rostedt@goodmis.org>2016-09-25 13:30:13 -0400
commit1ae2293dd6d2f5c823cf97e60b70d03631cd622f (patch)
tree1cd2b21bd5f6d29ba96ce66daa111cd38fd3aaed /kernel
parent1245800c0f96eb6ebb368593e251d66c01e61022 (diff)
downloadlinux-stericsson-1ae2293dd6d2f5c823cf97e60b70d03631cd622f.tar.gz
fix memory leaks in tracing_buffers_splice_read()
Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8fb4847b0450..77eeab2776ef 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5930,9 +5930,6 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
return -EBUSY;
#endif
- if (splice_grow_spd(pipe, &spd))
- return -ENOMEM;
-
if (*ppos & (PAGE_SIZE - 1))
return -EINVAL;
@@ -5942,6 +5939,9 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
len &= PAGE_MASK;
}
+ if (splice_grow_spd(pipe, &spd))
+ return -ENOMEM;
+
again:
trace_access_lock(iter->cpu_file);
entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
@@ -5999,19 +5999,21 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
/* did we read anything? */
if (!spd.nr_pages) {
if (ret)
- return ret;
+ goto out;
+ ret = -EAGAIN;
if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK))
- return -EAGAIN;
+ goto out;
ret = wait_on_pipe(iter, true);
if (ret)
- return ret;
+ goto out;
goto again;
}
ret = splice_to_pipe(pipe, &spd);
+out:
splice_shrink_spd(&spd);
return ret;