Shannon Baseband accept-type SDP Attribute Memory Corruption

Shannon Baseband suffers from a memory corruption vulnerability that occurs when the baseband modem processes SDP when setting up a call. SDP supports an attribute accept-type that allows multiple format types to be specified. The baseband software allocates a fixed-size buffer for these types, but does not check that the number of format types specified by the SDP is within this bound. This can lead to memory corruption when processing an accept-type attribute that contains more than 12 format types.