linux-kernel - [PATCH AUTOSEL 4.19 4/5] wifi: iwlwifi: mvm: avoid baid size integer overflow

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Message-Id: <20230709151632.514098-4-sashal@kernel.org>
Date:   Sun,  9 Jul 2023 11:16:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Johannes Berg <johannes.berg@...el.com>,
        Roee Goldfiner <roee.h.goldfiner@...el.com>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Sasha Levin <sashal@...nel.org>, kvalo@...nel.org,
        miriam.rachel.korenblit@...el.com, avraham.stern@...el.com,
        benjamin.berg@...el.com, jtornosm@...hat.com,
        linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 4/5] wifi: iwlwifi: mvm: avoid baid size integer overflow

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit 1a528ab1da324d078ec60283c34c17848580df24 ]

Roee reported various hard-to-debug crashes with pings in
EHT aggregation scenarios. Enabling KASAN showed that we
access the BAID allocation out of bounds, and looking at
the code a bit shows that since the reorder buffer entry
(struct iwl_mvm_reorder_buf_entry) is 128 bytes if debug
such as lockdep is enabled, then staring from an agg size
512 we overflow the size calculation, and allocate a much
smaller structure than we should, causing slab corruption
once we initialize this.

Fix this by simply using u32 instead of u16.

Reported-by: Roee Goldfiner <roee.h.goldfiner@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Gregory Greenman <gregory.greenman@...el.com>
Link: https://lore.kernel.org/r/20230620125813.f428c856030d.I2c2bb808e945adb71bc15f5b2bac2d8957ea90eb@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 373ace38edab7..83883ce7f55dc 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -2237,7 +2237,7 @@ int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	}
 
 	if (iwl_mvm_has_new_rx_api(mvm) && start) {
-		u16 reorder_buf_size = buf_size * sizeof(baid_data->entries[0]);
+		u32 reorder_buf_size = buf_size * sizeof(baid_data->entries[0]);
 
 		/* sparse doesn't like the __align() so don't check */
 #ifndef __CHECKER__
-- 
2.39.2