5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pei Xiao <xiaopei01@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Link: https://patch.msgid.link/1f16f8ae0e50ca9adb1dc849bf2ac65a40c9ceb9.1732783000.git.xiaopei01@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/spi/spi-mpc52xx.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c
index 51041526546dd..fa49e899f2b2e 100644
--- a/drivers/spi/spi-mpc52xx.c
+++ b/drivers/spi/spi-mpc52xx.c
@@ -521,6 +521,7 @@ static int mpc52xx_spi_remove(struct platform_device *op)
struct mpc52xx_spi *ms = spi_master_get_devdata(master);
int i;
+ cancel_work_sync(&ms->work);
free_irq(ms->irq0, ms);
free_irq(ms->irq1, ms);
--
2.43.0
