CVE-2024-38575

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

wifi: brcmfmac: pcie: handle randbuf allocation failure

The kzalloc() in brcmf_pcie_download_fw_nvram() will return null if the physical memory has run out. As a result, if we use get_random_bytes() to generate random bytes in the randbuf, the null pointer dereference bug will happen.

In order to prevent allocation failure, this patch adds a separate function using buffer on kernel stack to generate random bytes in the randbuf, which could prevent the kernel stack from overflow.

Affected Software

References

• https://git.kernel.org/stable/c/0eb2c0528e232b3c32cde9d5e1c9f80ba2996e49
• https://git.kernel.org/stable/c/316f790ebcf94bdf59f794b7cdea4068dc676d4c
• https://git.kernel.org/stable/c/3729ca9e48d19a03ae049e2bde510e161c2f3720
• https://git.kernel.org/stable/c/7c15eb344b0d4d3468c9b2a7591ad2b859b29b88
• https://git.kernel.org/stable/c/c37466406f075476c2702ecc01917928af871f3b