From: Stanislaw Gruszka Date: Tue, 16 Apr 2013 13:38:29 +0000 (+0200) Subject: iwlwifi: fix freeing uninitialized pointer X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=3309ccf7fcebceef540ebe90c65d2f94d745a45b;p=deliverable%2Flinux.git iwlwifi: fix freeing uninitialized pointer 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 Cc: stable@vger.kernel.org Reported-by: ian.odette@eprize.com Signed-off-by: Stanislaw Gruszka Reviewed-by: Emmanuel Grumbach Signed-off-by: Johannes Berg --- diff --git a/drivers/net/wireless/iwlwifi/dvm/debugfs.c b/drivers/net/wireless/iwlwifi/dvm/debugfs.c index 7b8178be119f..cb6dd5813fbc 100644 --- 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(struct file *file, 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; }