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x86,efi: Check max_size only if it is non-zero.

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Some EFI implementations return always a MaximumVariableSize of 0,
check against max_size only if it is non-zero.
My Intel DQ67SW desktop board has such an implementation.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Richard Weinberger 2013-04-10 10:59:34 +02:00 committed by Matt Fleming
parent a6e4d5a03e
commit 7791c8423f
1 changed files with 6 additions and 1 deletions
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7
arch/x86/platform/efi/efi.c
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@ -1018,7 +1018,12 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
if (status != EFI_SUCCESS)
return status;
if (!storage_size || size > remaining_size || size > max_size ||
if (!max_size && remaining_size > size)
printk_once(KERN_ERR FW_BUG "Broken EFI implementation"
" is returning MaxVariableSize=0\n");
if (!storage_size || size > remaining_size ||
(max_size && size > max_size) ||
(remaining_size - size) < (storage_size / 2))
return EFI_OUT_OF_RESOURCES;