From 113e2da2789ac680d2042993dcf76eef43072f4d Mon Sep 17 00:00:00 2001

From: Pavel Holica <conscript89@gmail.com>

Date: Wed, 6 Nov 2013 23:24:16 +0100

Subject: [PATCH] acpi-fpdt: break on zero or negative length read

https://bugzilla.redhat.com/show_bug.cgi?id=1027478

---

 src/shared/acpi-fpdt.c | 2 ++

 1 file changed, 2 insertions(+)

diff --git a/src/shared/acpi-fpdt.c b/src/shared/acpi-fpdt.c

index 75648b4..7bae47f 100644

--- a/src/shared/acpi-fpdt.c

+++ b/src/shared/acpi-fpdt.c

@@ -109,6 +109,8 @@ int acpi_get_boot_usec(usec_t *loader_start, usec_t *loader_exit) {

         for (rec = (struct acpi_fpdt_header *)(buf + sizeof(struct acpi_table_header));

              (char *)rec < buf + l;

              rec = (struct acpi_fpdt_header *)((char *)rec + rec->length)) {

+                if (rec->length <= 0)

+                        break;

                 if (rec->type != ACPI_FPDT_TYPE_BOOT)

                         continue;

                 if (rec->length != sizeof(struct acpi_fpdt_header))