From 7fd43f8a6b3043900ae0416720a0f8f4e08e2c9b Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 19 Apr 2017 09:58:50 +0200
Subject: [PATCH 056/146] iwlwifi: mvm: use scnprintf() instead of snprintf()
Git-commit: 40e86a3619a1e84ad73c716c943f65fc38eb1e28
Patch-mainline: v4.13-rc1
References: FATE#322675

It's safer to use scnprintf() here because the buffer might
be too short for the full format strings. In most cases
this isn't true because of external limits on the values.

In one case, this fixes a stack data leak.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 .../net/wireless/intel/iwlwifi/mvm/debugfs-vif.c   | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
index 5d475b4850ae..a7ac281e5cde 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
@@ -7,7 +7,7 @@
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
- * Copyright(c) 2016        Intel Deutschland GmbH
+ * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -34,7 +34,7 @@
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
- * Copyright(c) 2016        Intel Deutschland GmbH
+ * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -1304,11 +1304,11 @@ static ssize_t iwl_dbgfs_low_latency_read(struct file *file,
 	char buf[30] = {};
 	int len;
 
-	len = snprintf(buf, sizeof(buf) - 1,
-		       "traffic=%d\ndbgfs=%d\nvcmd=%d\n",
-		       mvmvif->low_latency_traffic,
-		       mvmvif->low_latency_dbgfs,
-		       mvmvif->low_latency_vcmd);
+	len = scnprintf(buf, sizeof(buf) - 1,
+			"traffic=%d\ndbgfs=%d\nvcmd=%d\n",
+			mvmvif->low_latency_traffic,
+			mvmvif->low_latency_dbgfs,
+			mvmvif->low_latency_vcmd);
 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 }
 
@@ -1385,10 +1385,12 @@ static ssize_t iwl_dbgfs_rx_phyinfo_read(struct file *file,
 	struct ieee80211_vif *vif = file->private_data;
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 	char buf[8];
+	int len;
 
-	snprintf(buf, sizeof(buf), "0x%04x\n", mvmvif->mvm->dbgfs_rx_phyinfo);
+	len = scnprintf(buf, sizeof(buf), "0x%04x\n",
+			mvmvif->mvm->dbgfs_rx_phyinfo);
 
-	return simple_read_from_buffer(user_buf, count, ppos, buf, sizeof(buf));
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 }
 
 static void iwl_dbgfs_quota_check(void *data, u8 *mac,
@@ -1439,7 +1441,7 @@ static ssize_t iwl_dbgfs_quota_min_read(struct file *file,
 	char buf[10];
 	int len;
 
-	len = snprintf(buf, sizeof(buf), "%d\n", mvmvif->dbgfs_quota_min);
+	len = scnprintf(buf, sizeof(buf), "%d\n", mvmvif->dbgfs_quota_min);
 
 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 }
-- 
2.12.3