iwlwifi: remove CMD_WANT_SKB flag if send_cmd_sync failure

In function iwl_send_cmd_sync(), if the flag CMD_WANT_SKB is set but
we are not provided with a valid SKB (cmd->meta.u.skb == NULL), we need
to remove the CMD_WANT_SKB flag from the TX cmd queue. Otherwise in case
the cmd comes in later, it will possibly set an invalid address. Thus
it causes an invalid memory access.

This fixed the bug http://bugzilla.kernel.org/show_bug.cgi?id=11326.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-hcmd.c b/drivers/net/wireless/iwlwifi/iwl-hcmd.c
index 8c71ad4..4b35b30 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-hcmd.c
+++ b/drivers/net/wireless/iwlwifi/iwl-hcmd.c
@@ -224,7 +224,7 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
                IWL_ERROR("Error: Response NULL in '%s'\n",
                          get_cmd_string(cmd->id));
                ret = -EIO;
-               goto out;
+               goto cancel;
        }
 
        ret = 0;

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index d645808..15f5655 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -745,7 +745,7 @@ static int iwl3945_send_cmd_sync(struct iwl3945_priv *priv, struct iwl3945_host_
                IWL_ERROR("Error: Response NULL in '%s'\n",
                          get_cmd_string(cmd->id));
                ret = -EIO;
-               goto out;
+               goto cancel;
        }
 
        ret = 0;