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| author | Ben Horgan <ben.horgan@arm.com> | 2026-08-06 15:46:30 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-08-07 11:57:04 +0000 |
| commit | fc996c39689bb15aa80e5366809434f7258fb703 (patch) | |
| tree | 031f2869c756de11853857ce7862e9fa3ad6aef0 | |
| parent | 2c43aced9be353f8428678a75495ca9d631dc927 (diff) | |
| download | linux-fc996c39689bb15aa80e5366809434f7258fb703.tar.gz linux-fc996c39689bb15aa80e5366809434f7258fb703.zip | |
arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt
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: f04046f2577a ("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>
| -rw-r--r-- | drivers/resctrl/mpam_devices.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 53942b331269..677ee118d839 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -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); |