{"id":"CVE-2024-39301","summary":"net/9p: fix uninit-value in p9_client_rpc()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix uninit-value in p9_client_rpc()\n\nSyzbot with the help of KMSAN reported the following error:\n\nBUG: KMSAN: uninit-value in trace_9p_client_res include/trace/events/9p.h:146 [inline]\nBUG: KMSAN: uninit-value in p9_client_rpc+0x1314/0x1340 net/9p/client.c:754\n trace_9p_client_res include/trace/events/9p.h:146 [inline]\n p9_client_rpc+0x1314/0x1340 net/9p/client.c:754\n p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031\n v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410\n v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122\n legacy_get_tree+0x114/0x290 fs/fs_context.c:662\n vfs_get_tree+0xa7/0x570 fs/super.c:1797\n do_new_mount+0x71f/0x15e0 fs/namespace.c:3352\n path_mount+0x742/0x1f20 fs/namespace.c:3679\n do_mount fs/namespace.c:3692 [inline]\n __do_sys_mount fs/namespace.c:3898 [inline]\n __se_sys_mount+0x725/0x810 fs/namespace.c:3875\n __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nUninit was created at:\n __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598\n __alloc_pages_node include/linux/gfp.h:238 [inline]\n alloc_pages_node include/linux/gfp.h:261 [inline]\n alloc_slab_page mm/slub.c:2175 [inline]\n allocate_slab mm/slub.c:2338 [inline]\n new_slab+0x2de/0x1400 mm/slub.c:2391\n ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525\n __slab_alloc mm/slub.c:3610 [inline]\n __slab_alloc_node mm/slub.c:3663 [inline]\n slab_alloc_node mm/slub.c:3835 [inline]\n kmem_cache_alloc+0x6d3/0xbe0 mm/slub.c:3852\n p9_tag_alloc net/9p/client.c:278 [inline]\n p9_client_prepare_req+0x20a/0x1770 net/9p/client.c:641\n p9_client_rpc+0x27e/0x1340 net/9p/client.c:688\n p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031\n v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410\n v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122\n legacy_get_tree+0x114/0x290 fs/fs_context.c:662\n vfs_get_tree+0xa7/0x570 fs/super.c:1797\n do_new_mount+0x71f/0x15e0 fs/namespace.c:3352\n path_mount+0x742/0x1f20 fs/namespace.c:3679\n do_mount fs/namespace.c:3692 [inline]\n __do_sys_mount fs/namespace.c:3898 [inline]\n __se_sys_mount+0x725/0x810 fs/namespace.c:3875\n __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nIf p9_check_errors() fails early in p9_client_rpc(), req-\u003erc.tag\nwill not be properly initialized. However, trace_9p_client_res()\nends up trying to print it out anyway before p9_client_rpc()\nfinishes.\n\nFix this issue by assigning default values to p9_fcall fields\nsuch as 'tag' and (just in case KMSAN unearths something new) 'id'\nduring the tag allocation stage.","modified":"2026-04-16T04:36:51.972921518Z","published":"2024-06-25T14:22:41.566Z","related":["SUSE-SU-2024:2372-1","SUSE-SU-2024:2394-1","SUSE-SU-2024:2493-1","SUSE-SU-2024:2561-1","SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2901-1","SUSE-SU-2024:2939-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/39xxx/CVE-2024-39301.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/124947855564572713d705a13be7d0c9dae16a17"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2101901dd58c6da4924bc5efb217a1d83436290b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/25460d6f39024cc3b8241b14c7ccf0d6f11a736a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c1791130b781c843572fb6391c4a4c5d857ab17"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72c5d8e416ecc46af370a1340b3db5ff0b0cc867"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89969ffbeb948ffc159d19252e7469490103011b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca71f204711ad24113e8b344dc5bb8b0385f5672"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fe5c604053c36c62af24eee8a76407d026ea5163"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/39xxx/CVE-2024-39301.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39301"},{"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":"348b59012e5c6402741d067cf6eeeb6271999d06"},{"fixed":"72c5d8e416ecc46af370a1340b3db5ff0b0cc867"},{"fixed":"2101901dd58c6da4924bc5efb217a1d83436290b"},{"fixed":"124947855564572713d705a13be7d0c9dae16a17"},{"fixed":"89969ffbeb948ffc159d19252e7469490103011b"},{"fixed":"ca71f204711ad24113e8b344dc5bb8b0385f5672"},{"fixed":"6c1791130b781c843572fb6391c4a4c5d857ab17"},{"fixed":"fe5c604053c36c62af24eee8a76407d026ea5163"},{"fixed":"25460d6f39024cc3b8241b14c7ccf0d6f11a736a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-39301.json"}}],"schema_version":"1.7.5"}