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path: root/drivers/scsi/st.c
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Diffstat (limited to 'drivers/scsi/st.c')
-rw-r--r--drivers/scsi/st.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index d50bad3a2ce9..9f480a1b4a81 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3756,7 +3756,7 @@ 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;