From: Martin Peschke <mp3@de.ibm.com>

Code looks more sane with this little cleanup, although both memcpy() and
kfree() are supposed to cope with NULL pointer or zero length respectively.

Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/statistic.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff -puN lib/statistic.c~statistics-infrastructure-small-cleanup-in-debugfs-write-function lib/statistic.c
--- a/lib/statistic.c~statistics-infrastructure-small-cleanup-in-debugfs-write-function
+++ a/lib/statistic.c
@@ -631,11 +631,13 @@ static ssize_t statistic_write_def(struc
 	if (!larger)
 		return -ENOMEM;
 	larger[*offset + len] = '\0';
-	memcpy(larger, seq_priv->w_buf, *offset);
+	if (seq_priv->w_buf) {
+		memcpy(larger, seq_priv->w_buf, *offset);
+		kfree(seq_priv->w_buf);
+	}
 	if (copy_from_user(larger + *offset, buf, len))
 		return -EFAULT;
 	*offset += len;
-	kfree(seq_priv->w_buf);
 	seq_priv->w_buf = larger;
 	seq_priv->w_offset = *offset;
 	return len;
_