[LU-15329] Possible integer overflow in quota_read_blk

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Affects Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Oleg Drokin

Description

In osd-ldiskfs quota_read_blk we have this bit:

        ret = sb->s_op->quota_read(sb, type, buf, LUSTRE_DQBLKSIZE,
                                   blk << LUSTRE_DQBLKSIZE_BITS); 

where blk is uint and LUSTRE_DQBLKSIZE_BITS is 10. the last quota_read argument is loff_t, as such cast to some 64 bit type seems warranted to avoid a potential overflow.