CVE-2021-47020

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

soundwire: stream: fix memory leak in stream config error path

When stream config is failed, master runtime will release all slave runtime in the slave_rt_list, but slave runtime is not added to the list at this time. This patch frees slave runtime in the config error path to fix the memory leak.

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/2f17ac005b320c85d686088cfd4c2e7017912b88
• https://git.kernel.org/stable/c/342260fe821047c3d515e3d28085d73fbdce3e80
• https://git.kernel.org/stable/c/48f17f96a81763c7c8bf5500460a359b9939359f
• https://git.kernel.org/stable/c/7c468deae306d0cbbd539408c26cfec04c66159a
• https://git.kernel.org/stable/c/870533403ffa28ff63e173045fc5369365642002
• https://git.kernel.org/stable/c/effd2bd62b416f6629e18e3ce077c60de14cfdea
• https://git.kernel.org/stable/c/2f17ac005b320c85d686088cfd4c2e7017912b88
• https://git.kernel.org/stable/c/342260fe821047c3d515e3d28085d73fbdce3e80
• https://git.kernel.org/stable/c/48f17f96a81763c7c8bf5500460a359b9939359f
• https://git.kernel.org/stable/c/7c468deae306d0cbbd539408c26cfec04c66159a
• https://git.kernel.org/stable/c/870533403ffa28ff63e173045fc5369365642002
• https://git.kernel.org/stable/c/effd2bd62b416f6629e18e3ce077c60de14cfdea