UBUNTU-CVE-2024-57985
In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: scm: Cleanup global '__scm' on probe failures If SCM driver fails the probe, it should not leave global '__scm' variable assigned, because external users of this driver will assume the probe finished successfully. For example TZMEM parts ('__scm->mempool') are initialized later in the probe, but users of it (__scm_smc_call()) rely on the '__scm' variable. This fixes theoretical NULL pointer exception, triggered via introducing probe deferral in SCM driver with call trace: qcom_tzmem_alloc+0x70/0x1ac (P) qcom_tzmem_alloc+0x64/0x1ac (L) qcom_scm_assign_mem+0x78/0x194 qcom_rmtfs_mem_probe+0x2d4/0x38c platform_probe+0x68/0xc8
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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16 explicit affected versions
3 explicit affected versions
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26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
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14 explicit affected versions
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78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: scm: Cleanup global '__scm' on probe failures If SCM driver fails the probe, it should not leave global '__scm' variable assigned, because external users of this driver will assume the probe finished successfully. For example TZMEM parts ('__scm->mempool') are initialized later in the probe, but users of it (__scm_smc_call()) rely on the '__scm' variable. This fixes theoretical NULL pointer exception, triggered via introducing probe deferral in SCM driver with call trace: qcom_tzmem_alloc+0x70/0x1ac (P) qcom_tzmem_alloc+0x64/0x1ac (L) qcom_scm_assign_mem+0x78/0x194 qcom_rmtfs_mem_probe+0x2d4/0x38c platform_probe+0x68/0xc8
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/1e76b546e6fca7eb568161f408133904ca6bcf4f
- https://git.kernel.org/stable/c/1e76b546e6fca7eb568161f408133904ca6bcf4f
- https://git.kernel.org/stable/c/390d3baeba51a126f75c97b90ec28b9384ce4b84
- https://git.kernel.org/stable/c/faf1715798fe72b79e4432ce8c6d03ca69765425
- https://ubuntu.com/security/CVE-2024-57985
- https://ubuntu.com/security/notices/USN-7521-1
- https://ubuntu.com/security/notices/USN-7521-2
- https://ubuntu.com/security/notices/USN-7521-3
- https://www.cve.org/CVERecord?id=CVE-2024-57985