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path: root/drivers/scsi/sd.c
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Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c34
1 files changed, 16 insertions, 18 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 51a5557f42dd..37df8bbe7f46 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -929,6 +929,7 @@ static int sd_done(struct scsi_cmnd *SCpnt)
unsigned int xfer_size = scsi_bufflen(SCpnt);
unsigned int good_bytes = result ? 0 : xfer_size;
u64 start_lba = SCpnt->request->sector;
+ u64 end_lba = SCpnt->request->sector + (xfer_size / 512);
u64 bad_lba;
struct scsi_sense_hdr sshdr;
int sense_valid = 0;
@@ -967,26 +968,23 @@ static int sd_done(struct scsi_cmnd *SCpnt)
goto out;
if (xfer_size <= SCpnt->device->sector_size)
goto out;
- switch (SCpnt->device->sector_size) {
- case 256:
+ if (SCpnt->device->sector_size < 512) {
+ /* only legitimate sector_size here is 256 */
start_lba <<= 1;
- break;
- case 512:
- break;
- case 1024:
- start_lba >>= 1;
- break;
- case 2048:
- start_lba >>= 2;
- break;
- case 4096:
- start_lba >>= 3;
- break;
- default:
- /* Print something here with limiting frequency. */
- goto out;
- break;
+ end_lba <<= 1;
+ } else {
+ /* be careful ... don't want any overflows */
+ u64 factor = SCpnt->device->sector_size / 512;
+ do_div(start_lba, factor);
+ do_div(end_lba, factor);
}
+
+ if (bad_lba < start_lba || bad_lba >= end_lba)
+ /* the bad lba was reported incorrectly, we have
+ * no idea where the error is
+ */
+ goto out;
+
/* This computation should always be done in terms of
* the resolution of the device's medium.
*/