ghsa-gg2j-w22v-f248
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
md/raid5: Remove unnecessary bio_put() in raid5_read_one_chunk()
When running chunk-sized reads on disks with badblocks duplicate bio free/puts are observed:
============================================================================= BUG bio-200 (Not tainted): Object already free
Allocated in mempool_alloc_slab+0x17/0x20 age=3 cpu=2 pid=7504 __slab_alloc.constprop.0+0x5a/0xb0 kmem_cache_alloc+0x31e/0x330 mempool_alloc_slab+0x17/0x20 mempool_alloc+0x100/0x2b0 bio_alloc_bioset+0x181/0x460 do_mpage_readpage+0x776/0xd00 mpage_readahead+0x166/0x320 blkdev_readahead+0x15/0x20 read_pages+0x13f/0x5f0 page_cache_ra_unbounded+0x18d/0x220 force_page_cache_ra+0x181/0x1c0 page_cache_sync_ra+0x65/0xb0 filemap_get_pages+0x1df/0xaf0 filemap_read+0x1e1/0x700 blkdev_read_iter+0x1e5/0x330 vfs_read+0x42a/0x570 Freed in mempool_free_slab+0x17/0x20 age=3 cpu=2 pid=7504 kmem_cache_free+0x46d/0x490 mempool_free_slab+0x17/0x20 mempool_free+0x66/0x190 bio_free+0x78/0x90 bio_put+0x100/0x1a0 raid5_make_request+0x2259/0x2450 md_handle_request+0x402/0x600 md_submit_bio+0xd9/0x120 __submit_bio+0x11f/0x1b0 submit_bio_noacct_nocheck+0x204/0x480 submit_bio_noacct+0x32e/0xc70 submit_bio+0x98/0x1a0 mpage_readahead+0x250/0x320 blkdev_readahead+0x15/0x20 read_pages+0x13f/0x5f0 page_cache_ra_unbounded+0x18d/0x220 Slab 0xffffea000481b600 objects=21 used=0 fp=0xffff8881206d8940 flags=0x17ffffc0010201(locked|slab|head|node=0|zone=2|lastcpupid=0x1fffff) CPU: 0 PID: 34525 Comm: kworker/u24:2 Not tainted 6.0.0-rc2-localyes-265166-gf11c5343fa3f #143 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: raid5wq raid5_do_work Call Trace: dump_stack_lvl+0x5a/0x78 dump_stack+0x10/0x16 print_trailer+0x158/0x165 object_err+0x35/0x50 free_debug_processing.cold+0xb7/0xbe __slab_free+0x1ae/0x330 kmem_cache_free+0x46d/0x490 mempool_free_slab+0x17/0x20 mempool_free+0x66/0x190 bio_free+0x78/0x90 bio_put+0x100/0x1a0 mpage_end_io+0x36/0x150 bio_endio+0x2fd/0x360 md_end_io_acct+0x7e/0x90 bio_endio+0x2fd/0x360 handle_failed_stripe+0x960/0xb80 handle_stripe+0x1348/0x3760 handle_active_stripes.constprop.0+0x72a/0xaf0 raid5_do_work+0x177/0x330 process_one_work+0x616/0xb20 worker_thread+0x2bd/0x6f0 kthread+0x179/0x1b0 ret_from_fork+0x22/0x30
The double free is caused by an unnecessary bio_put() in the if(is_badblock(...)) error path in raid5_read_one_chunk().
The error path was moved ahead of bio_alloc_clone() in c82aa1b76787c ("md/raid5: move checking badblock before clone bio in raid5_read_one_chunk"). The previous code checked and freed align_bio which required a bio_put. After the move that is no longer needed as raid_bio is returned to the control of the common io path which performs its own endio resulting in a double free on bad device blocks.
{
"affected": [],
"aliases": [
"CVE-2022-50752"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-24T13:16:01Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: Remove unnecessary bio_put() in raid5_read_one_chunk()\n\nWhen running chunk-sized reads on disks with badblocks duplicate bio\nfree/puts are observed:\n\n =============================================================================\n BUG bio-200 (Not tainted): Object already free\n -----------------------------------------------------------------------------\n Allocated in mempool_alloc_slab+0x17/0x20 age=3 cpu=2 pid=7504\n __slab_alloc.constprop.0+0x5a/0xb0\n kmem_cache_alloc+0x31e/0x330\n mempool_alloc_slab+0x17/0x20\n mempool_alloc+0x100/0x2b0\n bio_alloc_bioset+0x181/0x460\n do_mpage_readpage+0x776/0xd00\n mpage_readahead+0x166/0x320\n blkdev_readahead+0x15/0x20\n read_pages+0x13f/0x5f0\n page_cache_ra_unbounded+0x18d/0x220\n force_page_cache_ra+0x181/0x1c0\n page_cache_sync_ra+0x65/0xb0\n filemap_get_pages+0x1df/0xaf0\n filemap_read+0x1e1/0x700\n blkdev_read_iter+0x1e5/0x330\n vfs_read+0x42a/0x570\n Freed in mempool_free_slab+0x17/0x20 age=3 cpu=2 pid=7504\n kmem_cache_free+0x46d/0x490\n mempool_free_slab+0x17/0x20\n mempool_free+0x66/0x190\n bio_free+0x78/0x90\n bio_put+0x100/0x1a0\n raid5_make_request+0x2259/0x2450\n md_handle_request+0x402/0x600\n md_submit_bio+0xd9/0x120\n __submit_bio+0x11f/0x1b0\n submit_bio_noacct_nocheck+0x204/0x480\n submit_bio_noacct+0x32e/0xc70\n submit_bio+0x98/0x1a0\n mpage_readahead+0x250/0x320\n blkdev_readahead+0x15/0x20\n read_pages+0x13f/0x5f0\n page_cache_ra_unbounded+0x18d/0x220\n Slab 0xffffea000481b600 objects=21 used=0 fp=0xffff8881206d8940 flags=0x17ffffc0010201(locked|slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n CPU: 0 PID: 34525 Comm: kworker/u24:2 Not tainted 6.0.0-rc2-localyes-265166-gf11c5343fa3f #143\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n Workqueue: raid5wq raid5_do_work\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x5a/0x78\n dump_stack+0x10/0x16\n print_trailer+0x158/0x165\n object_err+0x35/0x50\n free_debug_processing.cold+0xb7/0xbe\n __slab_free+0x1ae/0x330\n kmem_cache_free+0x46d/0x490\n mempool_free_slab+0x17/0x20\n mempool_free+0x66/0x190\n bio_free+0x78/0x90\n bio_put+0x100/0x1a0\n mpage_end_io+0x36/0x150\n bio_endio+0x2fd/0x360\n md_end_io_acct+0x7e/0x90\n bio_endio+0x2fd/0x360\n handle_failed_stripe+0x960/0xb80\n handle_stripe+0x1348/0x3760\n handle_active_stripes.constprop.0+0x72a/0xaf0\n raid5_do_work+0x177/0x330\n process_one_work+0x616/0xb20\n worker_thread+0x2bd/0x6f0\n kthread+0x179/0x1b0\n ret_from_fork+0x22/0x30\n \u003c/TASK\u003e\n\nThe double free is caused by an unnecessary bio_put() in the\nif(is_badblock(...)) error path in raid5_read_one_chunk().\n\nThe error path was moved ahead of bio_alloc_clone() in c82aa1b76787c\n(\"md/raid5: move checking badblock before clone bio in\nraid5_read_one_chunk\"). The previous code checked and freed align_bio\nwhich required a bio_put. After the move that is no longer needed as\nraid_bio is returned to the control of the common io path which\nperforms its own endio resulting in a double free on bad device blocks.",
"id": "GHSA-gg2j-w22v-f248",
"modified": "2025-12-24T15:30:34Z",
"published": "2025-12-24T15:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50752"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/21a9c7354aa59e97e26ece5f0a609c8bfa43020d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7a37c58ee72e1fadd22c4ee990cb74c2ca2280e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c0fd5d4d8fd7b1a50306d7a23c720cf808f41fdf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c66a6f41e09ad386fd2cce22b9cded837bbbc704"
}
],
"schema_version": "1.4.0",
"severity": []
}
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