{"id":"CVE-2022-49902","summary":"block: Fix possible memory leak for rq_wb on add_disk failure","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix possible memory leak for rq_wb on add_disk failure\n\nkmemleak reported memory leaks in device_add_disk():\n\nkmemleak: 3 new suspected memory leaks\n\nunreferenced object 0xffff88800f420800 (size 512):\n  comm \"modprobe\", pid 4275, jiffies 4295639067 (age 223.512s)\n  hex dump (first 32 bytes):\n    04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00  ................\n    00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003c00000000d3662699\u003e] kmalloc_trace+0x26/0x60\n    [\u003c00000000edc7aadc\u003e] wbt_init+0x50/0x6f0\n    [\u003c0000000069601d16\u003e] wbt_enable_default+0x157/0x1c0\n    [\u003c0000000028fc393f\u003e] blk_register_queue+0x2a4/0x420\n    [\u003c000000007345a042\u003e] device_add_disk+0x6fd/0xe40\n    [\u003c0000000060e6aab0\u003e] nbd_dev_add+0x828/0xbf0 [nbd]\n    ...\n\nIt is because the memory allocated in wbt_enable_default() is not\nreleased in device_add_disk() error path.\nNormally, these memory are freed in:\n\ndel_gendisk()\n  rq_qos_exit()\n    rqos-\u003eops-\u003eexit(rqos);\n      wbt_exit()\n\nSo rq_qos_exit() is called to free the rq_wb memory for wbt_init().\nHowever in the error path of device_add_disk(), only\nblk_unregister_queue() is called and make rq_wb memory leaked.\n\nAdd rq_qos_exit() to the error path to fix it.","modified":"2026-04-03T13:14:40.584294Z","published":"2025-05-01T14:10:47.608Z","related":["SUSE-SU-2025:01966-1","SUSE-SU-2025:02173-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49902.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4e68c5da60cd79950bd56287ae80b39d6261f995"},{"type":"WEB","url":"https://git.kernel.org/stable/c/528677d3b4af985445bd4ac667485ded1ed11220"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa81cbafbf5764ad5053512152345fab37a1fe18"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49902.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49902"},{"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":"83cbce9574462c6b4eed6797bdaf18fae6859ab3"},{"fixed":"4e68c5da60cd79950bd56287ae80b39d6261f995"},{"fixed":"528677d3b4af985445bd4ac667485ded1ed11220"},{"fixed":"fa81cbafbf5764ad5053512152345fab37a1fe18"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49902.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}