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[2/3] iscsi: Don't blindly use designator length in response for memcpy

Message ID 20180629060328.4423-3-famz@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Fam Zheng June 29, 2018, 6:03 a.m. UTC 
Per SCSI definition the designator_length we receive from INQUIRY is 8,
12 or at most 16, but we should be careful because the remote iscsi
target may misbehave, otherwise we could have a buffer overflow.

Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/iscsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/block/iscsi.c b/block/iscsi.c
index 9f00fb47a5..4b7f574510 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2226,7 +2226,7 @@  static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
     desc[5] = (dd->designator_type & 0xF)
         | ((dd->association & 3) << 4);
     desc[7] = dd->designator_length;
-    memcpy(desc + 8, dd->designator, dd->designator_length);
+    memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
 
     desc[28] = 0;
     desc[29] = (lun->block_size >> 16) & 0xFF;