CVE-2022-50434

Summary

In the Linux kernel, the following vulnerability has been resolved:

blk-mq: fix possible memleak when register 'hctx' failed

There's issue as follows when do fault injection test: unreferenced object 0xffff888132a9f400 (size 512): comm "insmod", pid 308021, jiffies 4324277909 (age 509.733s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 f4 a9 32 81 88 ff ff ………..2…. 08 f4 a9 32 81 88 ff ff 00 00 00 00 00 00 00 00 …2………… backtrace: [<00000000e8952bb4>] kmalloc_node_trace+0x22/0xa0 [<00000000f9980e0f>] blk_mq_alloc_and_init_hctx+0x3f1/0x7e0 [<000000002e719efa>] blk_mq_realloc_hw_ctxs+0x1e6/0x230 [<000000004f1fda40>] blk_mq_init_allocated_queue+0x27e/0x910 [<00000000287123ec>] __blk_mq_alloc_disk+0x67/0xf0 [<00000000a2a34657>] 0xffffffffa2ad310f [<00000000b173f718>] 0xffffffffa2af824a [<0000000095a1dabb>] do_one_initcall+0x87/0x2a0 [<00000000f32fdf93>] do_init_module+0xdf/0x320 [<00000000cbe8541e>] load_module+0x3006/0x3390 [<0000000069ed1bdb>] __do_sys_finit_module+0x113/0x1b0 [<00000000a1a29ae8>] do_syscall_64+0x35/0x80 [<000000009cd878b0>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fault injection context as follows: kobject_add blk_mq_register_hctx blk_mq_sysfs_register blk_register_queue device_add_disk null_add_dev.part.0 [null_blk]

As 'blk_mq_register_hctx' may already add some objects when failed halfway, but there isn't do fallback, caller don't know which objects add failed. To solve above issue just do fallback when add objects failed halfway in 'blk_mq_register_hctx'.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < 654870789c3c1b9763316ef1c71d7a449127b175affected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < cb186eb47fb9dd327bdefa15f0c5fc55c53a40ddaffected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < 02bc8bc6eab03c84373281b85cb6e98747172ff7affected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < 87fd18016a47ea8ae12641377a390172c4aa97a7affected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < e8022da1fa2fdf2fa204b445dd3354e7a66d085aaffected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < eff45bfbc25a2509a6362dea6e699e14083c693caffected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < 4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95affected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < 33e8a3f61814ea30615d0fafaf50477975d6c1caaffected
LinuxLinux67aec14ce87fe25bdfff7dbf468556333df11c4e < 4b7a21c57b14fbcd0e1729150189e5933f5088e9affected
LinuxLinux3.16affected
LinuxLinux0 < 3.16unaffected
LinuxLinux4.9.337 <= 4.9.*unaffected
LinuxLinux4.14.303 <= 4.14.*unaffected
LinuxLinux4.19.270 <= 4.19.*unaffected
LinuxLinux5.4.229 <= 5.4.*unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.86 <= 5.15.*unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References