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fix memory leaks in tracing_buffers_splice_read()

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Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-09-17 18:31:46 -04:00 • committed by Steven Rostedt
parent 1245800c0f
commit 1ae2293dd6
1 changed files with 8 additions and 6 deletions
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14
kernel/trace/trace.c
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@ -5930,9 +5930,6 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
return -EBUSY; return -EBUSY;
#endif #endif
if (splice_grow_spd(pipe, &spd))
return -ENOMEM;
if (*ppos & (PAGE_SIZE - 1)) if (*ppos & (PAGE_SIZE - 1))
return -EINVAL; return -EINVAL;
@ -5942,6 +5939,9 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
len &= PAGE_MASK; len &= PAGE_MASK;
} }
if (splice_grow_spd(pipe, &spd))
return -ENOMEM;
again: again:
trace_access_lock(iter->cpu_file); trace_access_lock(iter->cpu_file);
entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, 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? */ /* did we read anything? */
if (!spd.nr_pages) { if (!spd.nr_pages) {
if (ret) if (ret)
return ret; goto out;
ret = -EAGAIN;
if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK))
return -EAGAIN; goto out;
ret = wait_on_pipe(iter, true); ret = wait_on_pipe(iter, true);
if (ret) if (ret)
return ret; goto out;
goto again; goto again;
} }
ret = splice_to_pipe(pipe, &spd); ret = splice_to_pipe(pipe, &spd);
out:
splice_shrink_spd(&spd); splice_shrink_spd(&spd);
return ret; return ret;