From 7a691bd34130920bef4d118a3f555ebc48544a63 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Fri, 28 Oct 2005 13:17:30 -0500 Subject: [PATCH] [SCSI] avoid overflows in disk size calculations Be more careful about doing the arithmetic in the non-LBD case. Signed-off-by: James Bottomley --- drivers/scsi/sd.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 9a1dc0cea03c..98da5c8057bf 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1253,14 +1253,13 @@ sd_read_capacity(struct scsi_disk *sdkp, char *diskname, * Jacques Gelinas (Jacques@solucorp.qc.ca) */ int hard_sector = sector_size; - sector_t sz = sdkp->capacity * (hard_sector/256); + sector_t sz = (sdkp->capacity/2) * (hard_sector/256); request_queue_t *queue = sdp->request_queue; - sector_t mb; + sector_t mb = sz; blk_queue_hardsect_size(queue, hard_sector); /* avoid 64-bit division on 32-bit platforms */ - mb = sz >> 1; - sector_div(sz, 1250); + sector_div(sz, 625); mb -= sz - 974; sector_div(mb, 1950);