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efivarfs: Ensure VariableName is NUL-terminated

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Some buggy firmware implementations update VariableNameSize on success
such that it does not include the final NUL character which results in
garbage in the efivarfs name entries.  Use kzalloc on the efivar_entry
(as is done in efivars.c) to ensure that the name is always
NUL-terminated.

The buggy firmware is:
BIOS Information
        Vendor: Intel Corp.
        Version: S1200RP.86B.02.02.0005.102320140911
        Release Date: 10/23/2014
        BIOS Revision: 4.6
System Information
        Manufacturer: Intel Corporation
        Product Name: S1200RP_SE

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Matthew Garrett <mjg59@coreos.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Ross Lagerwall 2015-04-02 08:39:00 +01:00 committed by Matt Fleming
parent bfbaafae85
commit c57dcb566d
1 changed files with 1 additions and 1 deletions
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2
fs/efivarfs/super.c
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@ -121,7 +121,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
int len, i;
int err = -ENOMEM;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return err;