CVE-2022-50752 in Linux
Resumen
por VulDB • 2026-05-23
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
md/raid5: Eliminar bio_put() innecesario en raid5_read_one_chunk()
Al realizar lecturas del tamaño de un bloque (chunk) en discos con badblocks, se observan liberaciones/puts duplicados de bio:
============================================================================= 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+0x138/0x1a0 page_cache_ra_order+0x238/0x3a0 do_readahead+0x130/0x1a0 __do_page_cache_readahead+0x280/0x320 ondemand_readahead+0x258/0x340 page_cache_async_readahead+0x130/0x160 generic_file_read_iter+0x380/0x530 new_sync_read+0x110/0x1a0 vfs_read+0x160/0x450 ksys_read+0x60/0xf0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed in bio_free+0x78/0x90 age=2 cpu=0 pid=34525 __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
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