diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-17 18:31:46 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-30 10:12:45 +0200 |
| commit | 09ae540c5e0aa7ea1f0c5573939a02e1d7e2a378 (patch) | |
| tree | 339a3d238cb5f7e2e06914684fb59bc9aad1b17b | |
| parent | 22f591e2171dc6e8210e0d891bbf7fcad19bf503 (diff) | |
| download | lwn-09ae540c5e0aa7ea1f0c5573939a02e1d7e2a378.tar.gz lwn-09ae540c5e0aa7ea1f0c5573939a02e1d7e2a378.zip | |
fix memory leaks in tracing_buffers_splice_read()
commit 1ae2293dd6d2f5c823cf97e60b70d03631cd622f upstream.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/trace/trace.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 8a4bd6b68a0b..50d8a8f5c46e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5929,9 +5929,6 @@ 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; @@ -5941,6 +5938,9 @@ 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); @@ -5998,19 +5998,21 @@ 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; |