Commit ce8fad9a authored Mar 28, 2017 by Brian Norris Committed by Kalle Valo Apr 05, 2017

mwifiex: fix use-after-free for FW reinit errors



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>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

parent 78b9ccb8

drivers/net/wireless/marvell/mwifiex/main.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -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: