1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 8d3e9c261061..26c536b51c5a 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -330,6 +330,14 @@ parse_dmar_table(void)
         entry_header = (struct acpi_dmar_header *)(dmar + 1);
         while (((unsigned long)entry_header) <
                         (((unsigned long)dmar) + dmar_tbl->length)) {
+                /* Avoid looping forever on bad ACPI tables */
+                if (entry_header->length == 0) {
+                        printk(KERN_WARNING PREFIX
+                                "Invalid 0-length structure\n");
+                        ret = -EINVAL;
+                        break;
+                }
+
                 dmar_table_print_dmar_entry(entry_header);
 
                 switch (entry_header->type) {