{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2024-40979", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix kernel crash during resume\n\nCurrently during resume, QMI target memory is not properly handled, resulting\nin kernel crash in case DMA remap is not supported:\n\nBUG: Bad page state in process kworker/u16:54 pfn:36e80\npage: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36e80\npage dumped because: nonzero _refcount\nCall Trace:\n bad_page\n free_page_is_bad_report\n __free_pages_ok\n __free_pages\n dma_direct_free\n dma_free_attrs\n ath12k_qmi_free_target_mem_chunk\n ath12k_qmi_msg_mem_request_cb\n\nThe reason is:\nOnce ath12k module is loaded, firmware sends memory request to host. In case\nDMA remap not supported, ath12k refuses the first request due to failure in\nallocating with large segment size:\n\nath12k_pci 0000:04:00.0: qmi firmware request memory request\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 7077888\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 8454144\nath12k_pci 0000:04:00.0: qmi dma allocation failed (7077888 B type 1), will try later with small size\nath12k_pci 0000:04:00.0: qmi delays mem_request 2\nath12k_pci 0000:04:00.0: qmi firmware request memory request\n\nLater firmware comes back with more but small segments and allocation\nsucceeds:\n\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 262144\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 65536\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\n\nNow ath12k is working. If suspend is triggered, firmware will be reloaded\nduring resume. As same as before, firmware requests two large segments at\nfirst. In ath12k_qmi_msg_mem_request_cb() segment count and size are\nassigned:\n\n\tab->qmi.mem_seg_count == 2\n\tab->qmi.target_mem[0].size == 7077888\n\tab->qmi.target_mem[1].size == 8454144\n\nThen allocation failed like before and ath12k_qmi_free_target_mem_chunk()\nis called to free all allocated segments. Note the first segment is skipped\nbecause its v.addr is cleared due to allocation failure:\n\n\tchunk->v.addr = dma_alloc_coherent()\n\nAlso note that this leaks that segment because it has not been freed.\n\nWhile freeing the second segment, a size of 8454144 is passed to\ndma_free_coherent(). However remember that this segment is allocated at\nthe first time firmware is loaded, before suspend. So its real size is\n524288, much smaller than 8454144. As a result kernel found we are freeing\nsome memory which is in use and thus cras\n---truncated---" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "1da177e4c3f4", "version_value": "bb50a4e711ff" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "6.9.7", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/bb50a4e711ff95348ad53641acb1306d89eb4c3a", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/bb50a4e711ff95348ad53641acb1306d89eb4c3a" }, { "url": "https://git.kernel.org/stable/c/303c017821d88ebad887814114d4e5966d320b28", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/303c017821d88ebad887814114d4e5966d320b28" } ] }, "generator": { "engine": "bippy-c9c4e1df01b2" } }