linux-kernel - [PATCH AUTOSEL 4.19 15/60] iwlwifi: Fix double-free problems in iwl_req_fw

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Message-Id: <20190627003616.20767-15-sashal@kernel.org>
Date:   Wed, 26 Jun 2019 20:35:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jia-Ju Bai <baijiaju1990@...il.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 15/60] iwlwifi: Fix double-free problems in iwl_req_fw_callback()

From: Jia-Ju Bai <baijiaju1990@...il.com>

[ Upstream commit a8627176b0de7ba3f4524f641ddff4abf23ae4e4 ]

In the error handling code of iwl_req_fw_callback(), iwl_dealloc_ucode()
is called to free data. In iwl_drv_stop(), iwl_dealloc_ucode() is called
again, which can cause double-free problems.

To fix this bug, the call to iwl_dealloc_ucode() in
iwl_req_fw_callback() is deleted.

This bug is found by a runtime fuzzing tool named FIZZER written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
index c0631255aee7..db6628d390a2 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
@@ -1547,7 +1547,6 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 	goto free;
 
  out_free_fw:
-	iwl_dealloc_ucode(drv);
 	release_firmware(ucode_raw);
  out_unbind:
 	complete(&drv->request_firmware_complete);
-- 
2.20.1