x86/tboot: check return value of dmar_table allocation

The allocation can just return NULL. Return an error value early instead of crashing later on. Signed-off-by: Hongyan Xia <[email protected]> Reviewed-by: Jan Beulich <[email protected]>
nephele-vm · Mar 24, 2020 · daed26b · daed26b
1 parent f10df65
commit daed26b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/xen/arch/x86/tboot.c b/xen/arch/x86/tboot.c
@@ -480,6 +480,8 @@ int __init tboot_parse_dmar_table(acpi_table_handler dmar_handler)
                       sizeof(dmar_table_length),
                       pa + sizeof(char) * ACPI_NAME_SIZE);
     dmar_table = xmalloc_bytes(dmar_table_length);
+    if ( !dmar_table )
+        return -ENOMEM;
     tboot_copy_memory(dmar_table, dmar_table_length, pa);
     clear_fixmap(FIX_TBOOT_MAP_ADDRESS);