[PATCH 4.19 15/91] iwlwifi: Fix double-free problems in iwl_req_fw_callback()

From: Greg Kroah-Hartman
Date: Fri Jul 12 2019 - 08:20:05 EST

[ 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@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;

- iwl_dealloc_ucode(drv);