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mwl8k: Fix use-after-free in mwl8k_fw_state_machine()

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[ Upstream commit 257051a235 ]

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>
This commit is contained in:
Zheyu Ma
2021-10-16 04:02:59 +00:00
committed by Greg Kroah-Hartman
parent a23957747d
commit 5a277907ff
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/marvell/mwl8k.c
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@ -5783,8 +5783,8 @@ 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