target: Fix inconsistent address passed to kunmap_atomic() in sbc_dif_copy_prot()
In sbc_dif_copy_prot(), the addresses passed to kunmap_atomic() are
inconsistent with the addresses which are mapped by kmap_atomic().
That could be problematic if an SG element has its length larger than
PAGE_SIZE as kunmap_atomic() will attempt to unmap different page.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: target-devel@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index d441975..d615a11 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -1300,13 +1300,14 @@
copied += len;
psg_len -= len;
+ kunmap_atomic(addr - sg->offset - offset);
+
if (offset >= sg->length) {
sg = sg_next(sg);
offset = 0;
}
- kunmap_atomic(addr);
}
- kunmap_atomic(paddr);
+ kunmap_atomic(paddr - psg->offset);
}
}
EXPORT_SYMBOL(sbc_dif_copy_prot);