x86, efi: Check table header length in efi_bgrt_init()

Header length should be validated for all ACPI tables before accessing any non-header field. Signed-off-by: Jan Beulich <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Acked-by: Matt Fleming <[email protected]> Signed-off-by: H. Peter Anvin <[email protected]>
rtvt123 · Nov 14, 2012 · 5d6d578 · 5d6d578
1 parent 89d1666
commit 5d6d578
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/arch/x86/platform/efi/efi-bgrt.c b/arch/x86/platform/efi/efi-bgrt.c
@@ -39,6 +39,8 @@ void efi_bgrt_init(void)
 	if (ACPI_FAILURE(status))
 		return;
 
+	if (bgrt_tab->header.length < sizeof(*bgrt_tab))
+		return;
 	if (bgrt_tab->version != 1)
 		return;
 	if (bgrt_tab->image_type != 0 || !bgrt_tab->image_address)