SCSI: sd: handle bad lba in sense information

patch 366c246de9cec909c5eba4f784c92d1e75b4dc38 in mainline.

Some devices report medium error locations incorrectly.  Add guards to
make sure the reported bad lba is actually in the request that caused
it.  Additionally remove the large case statment for sector sizes and
replace it with the proper u64 divisions.

Tested-by: Mike Snitzer <snitzer@gmail.com>
Cc: Stable Tree <stable@kernel.org>
Cc: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a69b155f39a2b2a1c4134b440e2cd5404d478e10..cfd859a614d466e97751451639df91142ddac09d 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -907,6 +907,7 @@ static int sd_done(struct scsi_cmnd *SCpnt)
        unsigned int xfer_size = SCpnt->request_bufflen;
        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;
@@ -945,26 +946,23 @@ 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.
                 */