soc: bcm: Check for NULL return of devm_kzalloc()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: soc: bcm: Check for NULL return of devm_kzalloc() As the potential failure of allocation, devm_kzalloc() may return NULL. Then the 'pd->pmb' and the follow lines of code may bring null pointer dereference. Therefore, it is better to check the return value of devm_kzalloc() to avoid this confusion.

References

• https://git.kernel.org/stable/c/5650e103bfc70156001615861fb8aafb3947da6e
• https://git.kernel.org/stable/c/36339ea7bae4943be01c8e9545e46e334591fecd
• https://git.kernel.org/stable/c/b48b98743b568bb219152ba2e15af6ef0d3d8a9b
• https://git.kernel.org/stable/c/b4bd2aafacce48db26b0a213d849818d940556dd