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spi: mpc52xx: Add cancel_work_sync before module remove

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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: ca632f5566 ("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>
This commit is contained in:
Pei Xiao 2024-11-28 16:38:17 +08:00 committed by Mark Brown
parent 40384c840e
commit 984836621a
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1 changed files with 1 additions and 0 deletions
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drivers/spi/spi-mpc52xx.c
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@ -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);