CVE-2022-49902 (GCVE-0-2022-49902)
Vulnerability from cvelistv5
Published
2025-05-01 14:10
Modified
2025-10-01 14:59
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: block: Fix possible memory leak for rq_wb on add_disk failure kmemleak reported memory leaks in device_add_disk(): kmemleak: 3 new suspected memory leaks unreferenced object 0xffff88800f420800 (size 512): comm "modprobe", pid 4275, jiffies 4295639067 (age 223.512s) hex dump (first 32 bytes): 04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00 ................ 00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000d3662699>] kmalloc_trace+0x26/0x60 [<00000000edc7aadc>] wbt_init+0x50/0x6f0 [<0000000069601d16>] wbt_enable_default+0x157/0x1c0 [<0000000028fc393f>] blk_register_queue+0x2a4/0x420 [<000000007345a042>] device_add_disk+0x6fd/0xe40 [<0000000060e6aab0>] nbd_dev_add+0x828/0xbf0 [nbd] ... It is because the memory allocated in wbt_enable_default() is not released in device_add_disk() error path. Normally, these memory are freed in: del_gendisk() rq_qos_exit() rqos->ops->exit(rqos); wbt_exit() So rq_qos_exit() is called to free the rq_wb memory for wbt_init(). However in the error path of device_add_disk(), only blk_unregister_queue() is called and make rq_wb memory leaked. Add rq_qos_exit() to the error path to fix it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e68c5da60cd79950bd56287ae80b39d6261f995Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/528677d3b4af985445bd4ac667485ded1ed11220Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa81cbafbf5764ad5053512152345fab37a1fe18Patch
Impacted products
Vendor Product Version
Linux Linux Version: 83cbce9574462c6b4eed6797bdaf18fae6859ab3
Version: 83cbce9574462c6b4eed6797bdaf18fae6859ab3
Version: 83cbce9574462c6b4eed6797bdaf18fae6859ab3
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   Linux Linux Version: 5.15
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Esto se debe a que la memoria asignada en wbt_enable_default() no se libera en la ruta de error device_add_disk(). Normalmente, esta memoria se libera en: del_gendisk() rq_qos_exit() rqos-\u0026gt;ops-\u0026gt;exit(rqos); wbt_exit(). Por lo tanto, se llama a rq_qos_exit() para liberar la memoria rq_wb para wbt_init(). Sin embargo, en la ruta de error de device_add_disk(), solo se llama a blk_unregister_queue(), lo que provoca una fuga de memoria en rq_wb. 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.