CVE-2022-48934

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

nfp: flower: Fix a potential leak in nfp_tunnel_add_shared_mac()

ida_simple_get() returns an id between min (0) and max (NFP_MAX_MAC_INDEX) inclusive. So NFP_MAX_MAC_INDEX (0xff) is a valid id.

In order for the error handling path to work correctly, the invalid value for ida_idx should not be in the 0..NFP_MAX_MAC_INDEX range, inclusive.

So set it to -1.

Weakness

The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

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/3a14d0888eb4b0045884126acc69abfb7b87814d
• https://git.kernel.org/stable/c/4086d2433576baf85f0e538511df97c8101e0a10
• https://git.kernel.org/stable/c/5ad5886f85b6bd893e3ed19013765fb0c243c069
• https://git.kernel.org/stable/c/9d8097caa73200710d52b9f4d9f430548f46a900
• https://git.kernel.org/stable/c/af4bc921d39dffdb83076e0a7eed1321242b7d87