[PATCH v2 3/3] hw/smbios: add an assertion to ensure tables 19 and 32 do not collide

[Ani Sinha]

Since change b3cddba9c14b034 ("hw/smbios: fix table memory corruption with 
large memory vms")
we reserve additional memory space between tables 17 and 19 for large VMs.
This may cause table 19 to collide with table 32 for those VMs. This change
adds an assertion to make sure table 19 does not extend into the memory used
by table 32.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
---
 hw/smbios/smbios.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index d7de740363..800a35e9a5 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -1048,6 +1048,9 @@ void smbios_get_tables(MachineState *ms,
                                        mem_array[i].length);
         }
 
+        /* we need to make sure table 19 and table 32 do not overlap */
+        assert((mem_array_size + offset) < (T32_BASE - T19_BASE));
+
         smbios_build_type_32_table();
         smbios_build_type_38_table();
         smbios_build_type_41_table(errp);
-- 
2.25.1