| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: free exchange changeset on failures\n\nFstests runs on my VMs have show several kmemleak reports like the following.\n\n unreferenced object 0xffff88811ae59080 (size 64):\n comm \"xfs_io\", pid 12124, jiffies 4294987392 (age 6.368s)\n hex dump (first 32 bytes):\n 00 c0 1c 00 00 00 00 00 ff cf 1c 00 00 00 00 00 ................\n 90 97 e5 1a 81 88 ff ff 90 97 e5 1a 81 88 ff ff ................\n backtrace:\n [<00000000ac0176d2>] ulist_add_merge+0x60/0x150 [btrfs]\n [<0000000076e9f312>] set_state_bits+0x86/0xc0 [btrfs]\n [<0000000014fe73d6>] set_extent_bit+0x270/0x690 [btrfs]\n [<000000004f675208>] set_record_extent_bits+0x19/0x20 [btrfs]\n [<00000000b96137b1>] qgroup_reserve_data+0x274/0x310 [btrfs]\n [<0000000057e9dcbb>] btrfs_check_data_free_space+0x5c/0xa0 [btrfs]\n [<0000000019c4511d>] btrfs_delalloc_reserve_space+0x1b/0xa0 [btrfs]\n [<000000006d37e007>] btrfs_dio_iomap_begin+0x415/0x970 [btrfs]\n [<00000000fb8a74b8>] iomap_iter+0x161/0x1e0\n [<0000000071dff6ff>] __iomap_dio_rw+0x1df/0x700\n [<000000002567ba53>] iomap_dio_rw+0x5/0x20\n [<0000000072e555f8>] btrfs_file_write_iter+0x290/0x530 [btrfs]\n [<000000005eb3d845>] new_sync_write+0x106/0x180\n [<000000003fb505bf>] vfs_write+0x24d/0x2f0\n [<000000009bb57d37>] __x64_sys_pwrite64+0x69/0xa0\n [<000000003eba3fdf>] do_syscall_64+0x43/0x90\n\nIn case brtfs_qgroup_reserve_data() or btrfs_delalloc_reserve_metadata()\nfail the allocated extent_changeset will not be freed.\n\nSo in btrfs_check_data_free_space() and btrfs_delalloc_reserve_space()\nfree the allocated extent_changeset to get rid of the allocated memory.\n\nThe issue currently only happens in the direct IO write path, but only\nafter 65b3c08606e5 (\"btrfs: fix ENOSPC failure when attempting direct IO\nwrite into NOCOW range\"), and also at defrag_one_locked_target(). Every\nother place is always calling extent_changeset_free() even if its call\nto btrfs_delalloc_reserve_space() or btrfs_check_data_free_space() has\nfailed." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/btrfs/delalloc-space.c" |
| ], |
| "versions": [ |
| { |
| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
| "lessThan": "ca06c5cb1b6dbfe67655b33c02fc394d65824519", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
| "lessThan": "da5e817d9d75422eaaa05490d0b9a5e328fc1a51", |
| "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/btrfs/delalloc-space.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.15.8", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.16", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionEndExcluding": "5.15.8" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionEndExcluding": "5.16" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/ca06c5cb1b6dbfe67655b33c02fc394d65824519" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/da5e817d9d75422eaaa05490d0b9a5e328fc1a51" |
| } |
| ], |
| "title": "btrfs: free exchange changeset on failures", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47508", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
