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fix memory leaks in tracing_buffers_splice_read()

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commit 1ae2293dd6d2f5c823cf97e60b70d03631cd622f upstream.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2016-09-17 18:31:46 -04:00 committed by Greg Kroah-Hartman
parent 3ee1b560e7
commit 369796a884
1 changed files with 8 additions and 6 deletions
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14
kernel/trace/trace.c
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@ -5766,9 +5766,6 @@ 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;
@ -5778,6 +5775,9 @@ 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);
@ -5835,19 +5835,21 @@ 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;