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Subject[PATCH 1/2] mwifiex: fix use-after-free for FW reinit errors
Date
If we fail to reinit the FW when resetting the device (in the
synchronous version of mwifiex_init_hw_fw() -> mwifiex_fw_dpc()),
mwifiex_fw_dpc() will tear down the interface and free up the adapter.
But we don't actually check for all failure cases of mwifiex_fw_dpc(),
so some of them fall through and dereference adapter->fw_done with a
freed adapter, causing a use-after-free bug.

In any case, mwifiex_fw_dpc() will always signal FW completion -- in the
error OR success case -- so at best, this was repeat work. Let's not do
it.

Signed-off-by: Brian Norris <briannorris@chromium.org>
---
drivers/net/wireless/marvell/mwifiex/main.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c
index 30f49944661f..98c83453ba5b 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.c
+++ b/drivers/net/wireless/marvell/mwifiex/main.c
@@ -1475,7 +1475,6 @@ mwifiex_reinit_sw(struct mwifiex_adapter *adapter)
}
mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__);

- complete_all(adapter->fw_done);
return 0;

err_init_fw:
--
2.12.2.564.g063fe858b8-goog
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