c37466406f
[ Upstream commit316f790ebc] 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. Fixes:91918ce88d("wifi: brcmfmac: pcie: Provide a buffer of random bytes to the device") Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://msgid.link/20240306140437.18177-1-duoming@zju.edu.cn Signed-off-by: Sasha Levin <sashal@kernel.org>