Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  ftrace: Initialize modname and offset in print_rec()  print_rec() leaves 'modname' and 'offset' uninitialized and kallsyms_lookup() only sets them on success. When the lookup fails like when a module is being loaded or unloaded, 'modname' holds a garbage value, passes the 'if (modname)' check, and is dereferenced by seq_printf().    Oops: general protection fault   RIP: 0010:string+0x48/0xe0   Call Trace:    vsnprintf+0x1f5/0x650    seq_printf+0x8e/0xb0    print_rec+0x6c/0xc0    t_show+0x4c/0x440    seq_read_iter+0x119/0x480  This can be triggered by reading available_filter_functions while a module is being loaded or unloaded.  Initialize both variables so a failed lookup skips the module name.