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Permit $VOLUME_NAME to be 0-sized, even when $AttrDef says otherwise. 

When clearing a volume name in Windows, $VOLUME_NAME is set to size 0, even if
the standard $AttrDef says that the minimum size is 2.

So the definition in $AttrDef doesn't reflect actual Windows behaviour in this
particular case, and to clear volume names ourselves the way Windows does it,
we must must add a special rule to permit us to truncate the $VOLUME_NAME
attribute to 0 even when $AttrDef specifies a higher value as minimum size.
edge.strict_endians
Erik Larsson 2011-09-12 09:07:00 +02:00
parent 178ae712c3
commit b8103bbcfe
1 changed files with 8 additions and 0 deletions
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8
libntfs-3g/attrib.c
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@ -3547,6 +3547,14 @@ int ntfs_attr_size_bounds_check(const ntfs_volume *vol, const ATTR_TYPES type,
min_size = sle64_to_cpu(ad->min_size);
max_size = sle64_to_cpu(ad->max_size);
/* The $AttrDef generated by Windows specifies 2 as min_size for the
* volume name attribute, but in reality Windows sets it to 0 when
* clearing the volume name. If we want to be able to clear the volume
* name we must also accept 0 as min_size, despite the $AttrDef
* definition. */
if(type == AT_VOLUME_NAME)
min_size = 0;
if ((min_size && (size < min_size)) ||
((max_size > 0) && (size > max_size))) {