[LU-9289] Fix fileset string length issue

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.10.0
• Affects Version/s: Lustre 2.9.0
• Labels: nodemap
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Sebastien Buisson (Inactive)

Description

Patch http://review.whamcloud.com/21857 added this code in nodemap_fileset_seq_write():

	OBD_ALLOC(nm_fileset, count);
	if (nm_fileset == NULL)
		RETURN(-ENOMEM);

	if (copy_from_user(nm_fileset, buffer, count))
		GOTO(out, rc = -EFAULT);

'count' is the length of the string to write. So it is necessary to allocate count+1 for nm_fileset in order to add a '\0' after copy_from_user().