Make sure log string is null-terminated.

logging.c

@@ -70,7 +70,7 @@ void vapplogsiz(int prio, int size, const char* fmt, va_list args)
 {
   if (opt_debug || prio != LOG_DEBUG) {
     if (use_syslog || opt_log_output || prio <= opt_log_level) {
-      char *tmp42 = (char *)calloc(size, 1);
+      char *tmp42 = (char *)calloc(size + 1, 1);
       vsnprintf(tmp42, size, fmt, args);
       _applog(prio, tmp42, false);
       free(tmp42);

ocl/build_kernel.c

@@ -126,8 +126,9 @@ cl_program build_opencl_kernel(build_kernel_data *data, const char *filename)
     applog(LOG_ERR, "Error %d: Building Program (clBuildProgram)", status);
     status = clGetProgramBuildInfo(program, *data->device, CL_PROGRAM_BUILD_LOG, 0, NULL, &log_size);
 
-    char *sz_log = (char *)malloc(log_size);
+    char *sz_log = (char *)malloc(log_size + 1);
     status = clGetProgramBuildInfo(program, *data->device, CL_PROGRAM_BUILD_LOG, log_size, sz_log, NULL);
+    sz_log[log_size] = '\0';
     applogsiz(LOG_ERR, log_size, "%s", sz_log);
     free(sz_log);
     goto out;