From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stanislaw Gruszka , Emmanuel Grumbach , Johannes Berg Subject: [ 015/115] iwlwifi: fix freeing uninitialized pointer Date: Mon, 6 May 2013 13:44:11 -0700 Message-Id: <20130506203057.156888797@linuxfoundation.org> In-Reply-To: <20130506203055.537199268@linuxfoundation.org> References: <20130506203055.537199268@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stanislaw Gruszka commit 3309ccf7fcebceef540ebe90c65d2f94d745a45b upstream. If on iwl_dump_nic_event_log() error occurs before that function initialize buf, we process uninitiated pointer in iwl_dbgfs_log_event_read() and can hit "BUG at mm/slub.c:3409" Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=951241 Reported-by: ian.odette@eprize.com Signed-off-by: Stanislaw Gruszka Reviewed-by: Emmanuel Grumbach Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/iwlwifi/dvm/debugfs.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/net/wireless/iwlwifi/dvm/debugfs.c +++ b/drivers/net/wireless/iwlwifi/dvm/debugfs.c @@ -2237,15 +2237,15 @@ static ssize_t iwl_dbgfs_log_event_read( size_t count, loff_t *ppos) { struct iwl_priv *priv = file->private_data; - char *buf; - int pos = 0; - ssize_t ret = -ENOMEM; + char *buf = NULL; + ssize_t ret; - ret = pos = iwl_dump_nic_event_log(priv, true, &buf, true); - if (buf) { - ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos); - kfree(buf); - } + ret = iwl_dump_nic_event_log(priv, true, &buf, true); + if (ret < 0) + goto err; + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); +err: + kfree(buf); return ret; }