CVE-2022-48656

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

dmaengine: ti: k3-udma-private: Fix refcount leak bug in of_xudma_dev_get()

We should call of_node_put() for the reference returned by of_parse_phandle() in fail path or when it is not used anymore. Here we only need to move the of_node_put() before the check.

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/a17df55bf6d536712da6902a83db82b82e67d5a2
• https://git.kernel.org/stable/c/aa11dae059a439af82bae541b134f8f53ac177b5
• https://git.kernel.org/stable/c/dd5a6c5a08752b613e83ad2cb5133e72a64b876d
• https://git.kernel.org/stable/c/f9fdb0b86f087c2b7f6c6168dd0985a3c1eda87e
• https://git.kernel.org/stable/c/a17df55bf6d536712da6902a83db82b82e67d5a2
• https://git.kernel.org/stable/c/aa11dae059a439af82bae541b134f8f53ac177b5
• https://git.kernel.org/stable/c/dd5a6c5a08752b613e83ad2cb5133e72a64b876d
• https://git.kernel.org/stable/c/f9fdb0b86f087c2b7f6c6168dd0985a3c1eda87e