| From | Greg Kroah-Hartman <> | Subject | [ 015/104] iwlwifi: fix freeing uninitialized pointer | Date | Mon, 6 May 2013 16:11:34 -0700 |
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3.8-stable review patch. If anyone has any objections, please let me know.
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From: Stanislaw Gruszka <sgruszka@redhat.com>
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 <sgruszka@redhat.com> Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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; }
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