From: Kai Mäkisara <Kai.Makisara@xxxxxxxxxxx> [ Upstream commit 5bb2d6179d1a8039236237e1e94cfbda3be1ed9e ] Struct mtget field mt_blkno -1 means it is unknown. Don't add anything to it. Signed-off-by: Kai Mäkisara <Kai.Makisara@xxxxxxxxxxx> Link: https://bugzilla.kernel.org/show_bug.cgi?id=219419#c14 Link: https://lore.kernel.org/r/20241106095723.63254-2-Kai.Makisara@xxxxxxxxxxx Reviewed-by: John Meneghini <jmeneghi@xxxxxxxxxx> Tested-by: John Meneghini <jmeneghi@xxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/scsi/st.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index b90a440e135dc..b91da7b51814a 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -3754,7 +3754,7 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); mt_status.mt_blkno = STps->drv_block; mt_status.mt_fileno = STps->drv_file; - if (STp->block_size != 0) { + if (STp->block_size != 0 && mt_status.mt_blkno >= 0) { if (STps->rw == ST_WRITING) mt_status.mt_blkno += (STp->buffer)->buffer_bytes / STp->block_size; -- 2.43.0
