> > + > > + if (range.start > ULLONG_MAX - BBSIZE) > > + return -XFS_ERROR(EINVAL); > > + > > There's no point checking for overflow on the range start - what we > need to check is whether it is larger than the size of the > filesystem. We do that after the conversion of range.start to basic > blocks, so that check needs to be promoted to before this. i.e. > > if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks)) > return -XFS_ERROR(EINVAL); > > > start = BTOBB(range.start); > > end = start + BTOBBT(range.len) - 1; > > minlen = BTOBB(max_t(u64, granularity, range.minlen)); > > And that will prevent the overflow in BTOBB() just as effectively...
You're right, that's a far better way, I'll change it so. Thanks! Tomas -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
