From: Amitkumar Karwar <akarwar@marvell.com>
To: <linux-wireless@vger.kernel.org>
Cc: Cathy Luo <cluo@marvell.com>,
Nishant Sarmukadam <nishants@marvell.com>, <rajatja@google.com>,
<briannorris@google.com>, <dmitry.torokhov@gmail.com>,
Amitkumar Karwar <akarwar@marvell.com>
Subject: [PATCH] mwifiex: fix kernel crash after shutdown command timeout
Date: Fri, 24 Feb 2017 18:59:24 +0530 [thread overview]
Message-ID: <1487942964-3193-1-git-send-email-akarwar@marvell.com> (raw)
We observed a SHUTDOWN command timeout during reboot stress test due
to a corner case firmware bug. It leads to use-after-free on adapter
structure pointer and crash.
We already have a cancel_work_sync() call in teardown thread. This
issue is fixed by having this call just before mwifiex_remove_card().
At this point no further work will be scheduled.
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
---
drivers/net/wireless/marvell/mwifiex/pcie.c | 3 +--
drivers/net/wireless/marvell/mwifiex/sdio.c | 3 +--
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index a0d9180..f31c5ea 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -294,8 +294,6 @@ static void mwifiex_pcie_remove(struct pci_dev *pdev)
if (!adapter || !adapter->priv_num)
return;
- cancel_work_sync(&card->work);
-
reg = card->pcie.reg;
if (reg)
ret = mwifiex_read_reg(adapter, reg->fw_status, &fw_status);
@@ -312,6 +310,7 @@ static void mwifiex_pcie_remove(struct pci_dev *pdev)
mwifiex_init_shutdown_fw(priv, MWIFIEX_FUNC_SHUTDOWN);
}
+ cancel_work_sync(&card->work);
mwifiex_remove_card(adapter);
}
diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index a4b356d..9534b47 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -387,8 +387,6 @@ static int mwifiex_check_winner_status(struct mwifiex_adapter *adapter)
if (!adapter || !adapter->priv_num)
return;
- cancel_work_sync(&card->work);
-
mwifiex_dbg(adapter, INFO, "info: SDIO func num=%d\n", func->num);
ret = mwifiex_sdio_read_fw_status(adapter, &firmware_stat);
@@ -400,6 +398,7 @@ static int mwifiex_check_winner_status(struct mwifiex_adapter *adapter)
mwifiex_init_shutdown_fw(priv, MWIFIEX_FUNC_SHUTDOWN);
}
+ cancel_work_sync(&card->work);
mwifiex_remove_card(adapter);
}
--
1.9.1
next reply other threads:[~2017-02-24 13:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-24 13:29 Amitkumar Karwar [this message]
2017-03-14 18:33 ` [PATCH] mwifiex: fix kernel crash after shutdown command timeout Brian Norris
2017-03-14 18:36 ` Brian Norris
2017-03-15 14:10 ` Amitkumar Karwar
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