{"id":"CVE-2025-37837","summary":"iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()\n\nTwo WARNINGs are observed when SMMU driver rolls back upon failure:\n arm-smmu-v3.9.auto: Failed to register iommu\n arm-smmu-v3.9.auto: probe with driver arm-smmu-v3 failed with error -22\n ------------[ cut here ]------------\n WARNING: CPU: 5 PID: 1 at kernel/dma/mapping.c:74 dmam_free_coherent+0xc0/0xd8\n Call trace:\n  dmam_free_coherent+0xc0/0xd8 (P)\n  tegra241_vintf_free_lvcmdq+0x74/0x188\n  tegra241_cmdqv_remove_vintf+0x60/0x148\n  tegra241_cmdqv_remove+0x48/0xc8\n  arm_smmu_impl_remove+0x28/0x60\n  devm_action_release+0x1c/0x40\n ------------[ cut here ]------------\n 128 pages are still in use!\n WARNING: CPU: 16 PID: 1 at mm/page_alloc.c:6902 free_contig_range+0x18c/0x1c8\n Call trace:\n  free_contig_range+0x18c/0x1c8 (P)\n  cma_release+0x154/0x2f0\n  dma_free_contiguous+0x38/0xa0\n  dma_direct_free+0x10c/0x248\n  dma_free_attrs+0x100/0x290\n  dmam_free_coherent+0x78/0xd8\n  tegra241_vintf_free_lvcmdq+0x74/0x160\n  tegra241_cmdqv_remove+0x98/0x198\n  arm_smmu_impl_remove+0x28/0x60\n  devm_action_release+0x1c/0x40\n\nThis is because the LVCMDQ queue memory are managed by devres, while that\ndmam_free_coherent() is called in the context of devm_action_release().\n\nJason pointed out that \"arm_smmu_impl_probe() has mis-ordered the devres\ncallbacks if ops-\u003edevice_remove() is going to be manually freeing things\nthat probe allocated\":\nhttps://lore.kernel.org/linux-iommu/20250407174408.GB1722458@nvidia.com/\n\nIn fact, tegra241_cmdqv_init_structures() only allocates memory resources\nwhich means any failure that it generates would be similar to -ENOMEM, so\nthere is no point in having that \"falling back to standard SMMU\" routine,\nas the standard SMMU would likely fail to allocate memory too.\n\nRemove the unwind part in tegra241_cmdqv_init_structures(), and return a\nproper error code to ask SMMU driver to call tegra241_cmdqv_remove() via\nimpl_ops-\u003edevice_remove(). Then, drop tegra241_vintf_free_lvcmdq() since\ndevres will take care of that.","modified":"2026-04-02T12:47:30.781176Z","published":"2025-05-09T06:41:48.164Z","related":["SUSE-SU-2025:02254-1","SUSE-SU-2025:02307-1","SUSE-SU-2025:02333-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37837.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5584dbf393df509159813645a487b1ef76557722"},{"type":"WEB","url":"https://git.kernel.org/stable/c/767e22001dfce64cc03b7def1562338591ab6031"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e38ed6908080047d8fa1763d1da86b584f9eb55b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e5dd974d6e00704553308ef1a88659f8dcfb39d4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37837.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-37837"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"483e0bd8883a40fd3dd3193997a4014337698d72"},{"fixed":"e5dd974d6e00704553308ef1a88659f8dcfb39d4"},{"fixed":"5584dbf393df509159813645a487b1ef76557722"},{"fixed":"e38ed6908080047d8fa1763d1da86b584f9eb55b"},{"fixed":"767e22001dfce64cc03b7def1562338591ab6031"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37837.json"}}],"schema_version":"1.7.5"}