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arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt

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If a user unbinds an MSC after mpam_disable() has been run in response
to an error interrupt then a dereference of a NULL pointer occurs as
mpam_disable() sets the drvdata to NULL. Add an early return to the driver
remove callback to avoid this.

Fixes: f04046f257 ("arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate")
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ben Horgan 2026-08-06 15:46:30 +01:00 committed by Will Deacon
parent 2c43aced9b
commit fc996c3968
1 changed files with 3 additions and 0 deletions
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3
drivers/resctrl/mpam_devices.c
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@ -2017,6 +2017,9 @@ static void mpam_msc_drv_remove(struct platform_device *pdev)
{
struct mpam_msc *msc = platform_get_drvdata(pdev);
if (!msc)
return;
mutex_lock(&mpam_list_lock);
mpam_msc_destroy(msc);
mutex_unlock(&mpam_list_lock);