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[11/16] iwmc3200wifi: Check for cmd pointer before dereferencing it

Message ID 1255670340-22565-12-git-send-email-yi.zhu@intel.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Zhu Yi Oct. 16, 2009, 5:18 a.m. UTC 
None
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Patch

diff --git a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c
index a6b1811..0fa3f5c 100644
--- a/drivers/net/wireless/iwmc3200wifi/rx.c
+++ b/drivers/net/wireless/iwmc3200wifi/rx.c
@@ -1058,8 +1058,14 @@  static int iwm_ntf_wifi_if_wrapper(struct iwm_priv *iwm, u8 *buf,
 				   unsigned long buf_size,
 				   struct iwm_wifi_cmd *cmd)
 {
-	struct iwm_umac_wifi_if *hdr =
-			(struct iwm_umac_wifi_if *)cmd->buf.payload;
+	struct iwm_umac_wifi_if *hdr;
+
+	if (cmd == NULL) {
+		IWM_ERR(iwm, "Couldn't find expected wifi command\n");
+		return -EINVAL;
+	}
+
+	hdr = (struct iwm_umac_wifi_if *)cmd->buf.payload;
 
 	IWM_DBG_NTF(iwm, DBG, "WIFI_IF_WRAPPER cmd is delivered to UMAC: "
 		    "oid is 0x%x\n", hdr->oid);