linux-kernel - [PATCH 082/190] Revert "rsi: Fix NULL pointer dereference in kmalloc"

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Date:   Wed, 21 Apr 2021 14:59:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Aditya Pakki <pakki001@....edu>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 082/190] Revert "rsi: Fix NULL pointer dereference in kmalloc"

This reverts commit d5414c2355b20ea8201156d2e874265f1cb0d775.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes.  The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix.  Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Aditya Pakki <pakki001@....edu>
Cc: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/rsi/rsi_91x_mac80211.c | 30 +++++++++------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/net/wireless/rsi/rsi_91x_mac80211.c b/drivers/net/wireless/rsi/rsi_91x_mac80211.c
index 16025300cddb..714d4d53236c 100644
--- a/drivers/net/wireless/rsi/rsi_91x_mac80211.c
+++ b/drivers/net/wireless/rsi/rsi_91x_mac80211.c
@@ -188,27 +188,27 @@ bool rsi_is_cipher_wep(struct rsi_common *common)
  * @adapter: Pointer to the adapter structure.
  * @band: Operating band to be set.
  *
- * Return: int - 0 on success, negative error on failure.
+ * Return: None.
  */
-static int rsi_register_rates_channels(struct rsi_hw *adapter, int band)
+static void rsi_register_rates_channels(struct rsi_hw *adapter, int band)
 {
 	struct ieee80211_supported_band *sbands = &adapter->sbands[band];
 	void *channels = NULL;
 
 	if (band == NL80211_BAND_2GHZ) {
-		channels = kmemdup(rsi_2ghz_channels, sizeof(rsi_2ghz_channels),
-				   GFP_KERNEL);
-		if (!channels)
-			return -ENOMEM;
+		channels = kmalloc(sizeof(rsi_2ghz_channels), GFP_KERNEL);
+		memcpy(channels,
+		       rsi_2ghz_channels,
+		       sizeof(rsi_2ghz_channels));
 		sbands->band = NL80211_BAND_2GHZ;
 		sbands->n_channels = ARRAY_SIZE(rsi_2ghz_channels);
 		sbands->bitrates = rsi_rates;
 		sbands->n_bitrates = ARRAY_SIZE(rsi_rates);
 	} else {
-		channels = kmemdup(rsi_5ghz_channels, sizeof(rsi_5ghz_channels),
-				   GFP_KERNEL);
-		if (!channels)
-			return -ENOMEM;
+		channels = kmalloc(sizeof(rsi_5ghz_channels), GFP_KERNEL);
+		memcpy(channels,
+		       rsi_5ghz_channels,
+		       sizeof(rsi_5ghz_channels));
 		sbands->band = NL80211_BAND_5GHZ;
 		sbands->n_channels = ARRAY_SIZE(rsi_5ghz_channels);
 		sbands->bitrates = &rsi_rates[4];
@@ -227,7 +227,6 @@ static int rsi_register_rates_channels(struct rsi_hw *adapter, int band)
 	sbands->ht_cap.mcs.rx_mask[0] = 0xff;
 	sbands->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
 	/* sbands->ht_cap.mcs.rx_highest = 0x82; */
-	return 0;
 }
 
 static int rsi_mac80211_hw_scan_start(struct ieee80211_hw *hw,
@@ -2067,16 +2066,11 @@ int rsi_mac80211_attach(struct rsi_common *common)
 	wiphy->available_antennas_rx = 1;
 	wiphy->available_antennas_tx = 1;
 
-	status = rsi_register_rates_channels(adapter, NL80211_BAND_2GHZ);
-	if (status)
-		return status;
+	rsi_register_rates_channels(adapter, NL80211_BAND_2GHZ);
 	wiphy->bands[NL80211_BAND_2GHZ] =
 		&adapter->sbands[NL80211_BAND_2GHZ];
 	if (common->num_supp_bands > 1) {
-		status = rsi_register_rates_channels(adapter,
-						     NL80211_BAND_5GHZ);
-		if (status)
-			return status;
+		rsi_register_rates_channels(adapter, NL80211_BAND_5GHZ);
 		wiphy->bands[NL80211_BAND_5GHZ] =
 			&adapter->sbands[NL80211_BAND_5GHZ];
 	}
-- 
2.31.1