CVE-2022-49746

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

dmaengine: imx-sdma: Fix a possible memory leak in sdma_transfer_init

If the function sdma_load_context() fails, the sdma_desc will be freed, but the allocated desc->bd is forgot to be freed.

We already met the sdma_load_context() failure case and the log as below: [ 450.699064] imx-sdma 30bd0000.dma-controller: Timeout waiting for CH0 ready …

In this case, the desc->bd will not be freed without this change.

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/1417f59ac0b02130ee56c0c50794b9b257be3d17
• https://git.kernel.org/stable/c/43acd767bd90c5d4172ce7fee5d9007a9a08dea9
• https://git.kernel.org/stable/c/80ee99e52936b2c04cc37b17a14b2ae2f9d282ac
• https://git.kernel.org/stable/c/bd0050b7ffa87c7b260d563646af612f4112a778
• https://git.kernel.org/stable/c/ce4745a6b8016fae74c95dcd457d4ceef7d98af1
• https://git.kernel.org/stable/c/dbe634ce824329d8f14079c3e9f8f11670894bec