CVE-2022-49458 — drm/msm: don't free the IRQ if it was not requested

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

drm/msm: don't free the IRQ if it was not requested

As msm_drm_uninit() is called from the msm_drm_init() error path, additional care should be necessary as not to call the free_irq() for the IRQ that was not requested before (because an error occured earlier than the request_irq() call).

This fixed the issue reported with the following backtrace:

[ 8.571329] Trying to free already-free IRQ 187 [ 8.571339] WARNING: CPU: 0 PID: 76 at kernel/irq/manage.c:1895 free_irq+0x1e0/0x35c [ 8.588746] Modules linked in: pmic_glink pdr_interface fastrpc qrtr_smd snd_soc_hdmi_codec msm fsa4480 gpu_sched drm_dp_aux_bus qrtr i2c_qcom_geni crct10dif_ce qcom_stats qcom_q6v5_pas drm_display_helper gpi qcom_pil_info drm_kms_helper qcom_q6v5 qcom_sysmon qcom_common qcom_glink_smem qcom_rng mdt_loader qmi_helpers phy_qcom_qmp ufs_qcom typec qnoc_sm8350 socinfo rmtfs_mem fuse drm ipv6 [ 8.624154] CPU: 0 PID: 76 Comm: kworker/u16:2 Not tainted 5.18.0-rc5-next-20220506-00033-g6cee8cab6089-dirty #419 [ 8.624161] Hardware name: Qualcomm Technologies, Inc. SM8350 HDK (DT) [ 8.641496] Workqueue: events_unbound deferred_probe_work_func [ 8.647510] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 8.654681] pc : free_irq+0x1e0/0x35c [ 8.658454] lr : free_irq+0x1e0/0x35c [ 8.662228] sp : ffff800008ab3950 [ 8.665642] x29: ffff800008ab3950 x28: 0000000000000000 x27: ffff16350f56a700 [ 8…

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CVE-2022-49458 — drm/msm: don't free the IRQ if it was not requested