spi: mpc52xx: Add cancel_work_sync before module remove

[ Upstream commit 984836621aad98802d92c4a3047114cf518074c8 ]

If we remove the module which will call mpc52xx_spi_remove
it will free 'ms' through spi_unregister_controller.
while the work ms->work will be used. The sequence of operations
that may lead to a UAF bug.

Fix it by ensuring that the work is canceled before proceeding with
the cleanup in mpc52xx_spi_remove.

Fixes: ca632f556697 ("spi: reorganize drivers")
Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
Link: https://patch.msgid.link/1f16f8ae0e50ca9adb1dc849bf2ac65a40c9ceb9.1732783000.git.xiaopei01@kylinos.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c
index d5ac60c135c20a4b438e9074f262b5b63d6c0e85..159f359d7501aa24b6cb7b760f7062a2e9cd1a9a 100644 (file)
--- a/drivers/spi/spi-mpc52xx.c
+++ b/drivers/spi/spi-mpc52xx.c
@@ -520,6 +520,7 @@ static void mpc52xx_spi_remove(struct platform_device *op)
        struct mpc52xx_spi *ms = spi_controller_get_devdata(host);
        int i;
 
+       cancel_work_sync(&ms->work);
        free_irq(ms->irq0, ms);
        free_irq(ms->irq1, ms);