CVE-2022-49458

/// Technical description

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/

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References