Buffer Overflow

libzephyr.so is vulnerable to Buffer Overflow. The vulnerability is due to the imx_mu_ipm_send function in ipm_imx.c and the mcux_mailbox_ipm_send function in ipm_mcux.c which is susceptible to buffer overflow if the size parameter is negative, as a result of signed/unsigned conversion mishandling. The fix introduces a static int send in ipm_cavs_host.c check to ensure that the size is neither negative nor exceeds MAX_MSG.