{ "containers": { "cna": { "providerMetadata": { "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()\n\nSyzbot reported a null-ptr-deref bug:\n\n NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP\n frequency < 30 seconds\n general protection fault, probably for non-canonical address\n 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n CPU: 1 PID: 3603 Comm: segctord Not tainted\n 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google\n 10/11/2022\n RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0\n fs/nilfs2/alloc.c:608\n Code: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00\n 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 <80> 3c 02\n 00 0f 85 26 05 00 00 49 8b 46 10 be a6 00 00 00 48 c7 c7\n RSP: 0018:ffffc90003dff830 EFLAGS: 00010212\n RAX: dffffc0000000000 RBX: ffff88802594e218 RCX: 000000000000000d\n RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000010\n RBP: ffff888071880222 R08: 0000000000000005 R09: 000000000000003f\n R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158\n R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004\n FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000)\n knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0\n Call Trace:\n \n nilfs_dat_commit_free fs/nilfs2/dat.c:114 [inline]\n nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193\n nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236\n nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940\n nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline]\n nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline]\n nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088\n nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337\n nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568\n nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018\n nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067\n nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]\n nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline]\n nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045\n nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379\n nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline]\n nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570\n kthread+0x2e4/0x3a0 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n \n ...\n\nIf DAT metadata file is corrupted on disk, there is a case where\nreq->pr_desc_bh is NULL and blocknr is 0 at nilfs_dat_commit_end() during\na b-tree operation that cascadingly updates ancestor nodes of the b-tree,\nbecause nilfs_dat_commit_alloc() for a lower level block can initialize\nthe blocknr on the same DAT entry between nilfs_dat_prepare_end() and\nnilfs_dat_commit_end().\n\nIf this happens, nilfs_dat_commit_end() calls nilfs_dat_commit_free()\nwithout valid buffer heads in req->pr_desc_bh and req->pr_bitmap_bh, and\ncauses the NULL pointer dereference above in\nnilfs_palloc_commit_free_entry() function, which leads to a crash.\n\nFix this by adding a NULL check on req->pr_desc_bh and req->pr_bitmap_bh\nbefore nilfs_palloc_commit_free_entry() in nilfs_dat_commit_free().\n\nThis also calls nilfs_error() in that case to notify that there is a fatal\nflaw in the filesystem metadata and prevent further operations." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nilfs2/dat.c" ], "versions": [ { "version": "1da177e4c3f4", "lessThan": "2f2c59506ae3", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "165c7a3b27a3", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "bc3fd3293887", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "9a130b72e6bd", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "e858917ab785", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "33021419fd81", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "381b84f60e54", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "f0a0ccda18d6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nilfs2/dat.c" ], "versions": [ { "version": "4.9.335", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.14.301", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.19.268", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.226", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.158", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.82", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.0.12", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63" }, { "url": "https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68" }, { "url": "https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89" }, { "url": "https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07" }, { "url": "https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847" }, { "url": "https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce" }, { "url": "https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756" }, { "url": "https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4" } ], "title": "nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()", "x_generator": { "engine": "bippy-c9c4e1df01b2" } } }, "cveMetadata": { "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", "cveID": "CVE-2022-49007", "requesterUserId": "gregkh@kernel.org", "serial": "1", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.0" }