diff options
| author | Zheyu Ma <zheyuma97@gmail.com> | 2021-10-16 04:02:59 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-26 11:36:06 +0100 |
| commit | d883967ec2e97add1b7733480a6719e0f4d5dd6b (patch) | |
| tree | 5e4bc58a704925443e4c5dafd06fbd435e864ffb | |
| parent | 4d8a391e0aaf6cf2ba05dc8a9181f5d26c7e80db (diff) | |
mwl8k: Fix use-after-free in mwl8k_fw_state_machine()
[ Upstream commit 257051a235c17e33782b6e24a4b17f2d7915aaec ]
When the driver fails to request the firmware, it calls its error
handler. In the error handler, the driver detaches device from driver
first before releasing the firmware, which can cause a use-after-free bug.
Fix this by releasing firmware first.
The following log reveals it:
[ 9.007301 ] BUG: KASAN: use-after-free in mwl8k_fw_state_machine+0x320/0xba0
[ 9.010143 ] Workqueue: events request_firmware_work_func
[ 9.010830 ] Call Trace:
[ 9.010830 ] dump_stack_lvl+0xa8/0xd1
[ 9.010830 ] print_address_description+0x87/0x3b0
[ 9.010830 ] kasan_report+0x172/0x1c0
[ 9.010830 ] ? mutex_unlock+0xd/0x10
[ 9.010830 ] ? mwl8k_fw_state_machine+0x320/0xba0
[ 9.010830 ] ? mwl8k_fw_state_machine+0x320/0xba0
[ 9.010830 ] __asan_report_load8_noabort+0x14/0x20
[ 9.010830 ] mwl8k_fw_state_machine+0x320/0xba0
[ 9.010830 ] ? mwl8k_load_firmware+0x5f0/0x5f0
[ 9.010830 ] request_firmware_work_func+0x172/0x250
[ 9.010830 ] ? read_lock_is_recursive+0x20/0x20
[ 9.010830 ] ? process_one_work+0x7a1/0x1100
[ 9.010830 ] ? request_firmware_nowait+0x460/0x460
[ 9.010830 ] ? __this_cpu_preempt_check+0x13/0x20
[ 9.010830 ] process_one_work+0x9bb/0x1100
Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1634356979-6211-1-git-send-email-zheyuma97@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/wireless/marvell/mwl8k.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/marvell/mwl8k.c b/drivers/net/wireless/marvell/mwl8k.c index 6769b0c5a5cd..ee842797570b 100644 --- a/drivers/net/wireless/marvell/mwl8k.c +++ b/drivers/net/wireless/marvell/mwl8k.c @@ -5793,8 +5793,8 @@ static void mwl8k_fw_state_machine(const struct firmware *fw, void *context) fail: priv->fw_state = FW_STATE_ERROR; complete(&priv->firmware_loading_complete); - device_release_driver(&priv->pdev->dev); mwl8k_release_firmware(priv); + device_release_driver(&priv->pdev->dev); } #define MAX_RESTART_ATTEMPTS 1 |