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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 <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/509A9E6002000078000A7079@nat28.tlf.novell.com
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Jan Beulich 2012-11-07 16:46:08 +00:00 committed by H. Peter Anvin
parent 89d16665d3
commit 5d6d578c17
1 changed files with 2 additions and 0 deletions
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2
arch/x86/platform/efi/efi-bgrt.c
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@ -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)