On 05/16/2016 05:44 PM, Bart Van Assche wrote: > On 05/16/2016 11:46 AM, mchristi@xxxxxxxxxx wrote: >> logical_block_size and max_blocks are 32 bits, so we can >> overflow when trying to convert SCSI device blocks to linux >> block layer sectors. >> >> Signed-off-by: Mike Christie <mchristi@xxxxxxxxxx> >> Cc: stable@xxxxxxxxxxxxxxx >> >> --- >> drivers/scsi/sd.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c >> index f52b74c..1668e1d 100644 >> --- a/drivers/scsi/sd.c >> +++ b/drivers/scsi/sd.c >> @@ -690,7 +690,8 @@ static void sd_config_discard(struct scsi_disk >> *sdkp, unsigned int mode) >> - blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> >> 9)); >> + blk_queue_max_discard_sectors(q, (u64)max_blocks * >> + (logical_block_size >> 9)); > > Hello Mike, > > As far as I can see max_blocks <= 0xffff (SD_MAX_WS10_BLOCKS) and 512 <= > logical_block_size <= 4096. How can max_blocks * (logical_block_size >> > 9) be too large for a 32 bit integer? > Oops yeah, you are right. I forgot I modified the code to test the target patch. The patch is not needed. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
