CVE-2022-50352

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

net: hns: fix possible memory leak in hnae_ae_register()

Inject fault while probing module, if device_register() fails, but the refcount of kobject is not decreased to 0, the name allocated in dev_set_name() is leaked. Fix this by calling put_device(), so that name can be freed in callback function kobject_cleanup().

unreferenced object 0xffff00c01aba2100 (size 128): comm systemd-udevd, pid 1259, jiffies 4294903284 (age 294.152s) hex dump (first 32 bytes): 68 6e 61 65 30 00 00 00 18 21 ba 1a c0 00 ff ff hnae0….!…… 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ……………. backtrace: [<0000000034783f26>] slab_post_alloc_hook+0xa0/0x3e0 [<00000000748188f2>] __kmem_cache_alloc_node+0x164/0x2b0 [<00000000ab0743e8>] __kmalloc_node_track_caller+0x6c/0x390 [<000000006c0ffb13>] kvasprintf+0x8c/0x118 [<00000000fa27bfe1>] kvasprintf_const+0x60/0xc8 [<0000000083e10ed7>] kobject_set_name_vargs+0x3c/0xc0 [<000000000b87affc>] dev_set_name+0x7c/0xa0 [<000000003fd8fe26>] hnae_ae_register+0xcc/0x190 [hnae] [<00000000fe97edc9>] hns_dsaf_ae_init+0x9c/0x108 [hns_dsaf] [<00000000c36ff1eb>] hns_dsaf_probe+0x548/0x748 [hns_dsaf]

Weakness

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• https://git.kernel.org/stable/c/02dc0db19d944b4a90941db505ecf1aaec714be4
• https://git.kernel.org/stable/c/2974f3b330ef25f5d34a4948d04290c2cd7802cf
• https://git.kernel.org/stable/c/3b78453cca046d3b03853f0d077ad3ad130db886
• https://git.kernel.org/stable/c/7ae1345f6ad715acbcdc9e1ac28153684fd498bb
• https://git.kernel.org/stable/c/91f8f5342bee726ed5692583d58f69e7cc9ae60e
• https://git.kernel.org/stable/c/a3c148955c22fe1d94d7a2096005679c1f22eddf
• https://git.kernel.org/stable/c/dfc0337c6dceb6449403b33ecb141f4a1458a1e9
• https://git.kernel.org/stable/c/ff2f5ec5d009844ec28f171123f9e58750cef4bf