term/ns8250: return in case of a null SPCR base addresses

Serial SPCR MMIO null address are invalid, so return from function, otherwise invalid 'mmio,0' port names are generated halting the system when running terminal_input|output commands. Signed-off-by: Leo Sandoval <[email protected]>
rhboot · Jan 14, 2025 · d3e03cc · d3e03cc
1 parent df6160b
commit d3e03cc
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/grub-core/term/ns8250.c b/grub-core/term/ns8250.c
@@ -407,6 +407,9 @@ grub_serial_ns8250_add_mmio (grub_addr_t addr, unsigned int acc_size,
   struct grub_serial_port *p;
   unsigned i;
 
+  if (addr == NULL)
+    return NULL;
+
   for (i = 0; i < GRUB_SERIAL_PORT_NUM; i++)
     if (com_ports[i].use_mmio == true && com_ports[i].mmio.base == addr)
       {