[src/trunk]: src/sys/dev/scsipi the number of possible ATAPI devices on an AT...

[chs <chs%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/45af67715124
branches:  trunk
changeset: 969201:45af67715124
user:      chs <chs%NetBSD.org@localhost>
date:      Wed Feb 12 00:19:07 2020 +0000

description:
the number of possible ATAPI devices on an ATA bus is not always 2,
it is however many devices the underlying ATA bus can have (eg. 1 for SATA),
so initialize the scsipi chan_ntargets from the ATA ch_ndrives.
this fixes a memory read overrun detected by KASAN.
discussed with mlelstv@ and jdolecek@

diffstat:

 sys/dev/scsipi/atapi_wdc.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r f787288a45f4 -r 45af67715124 sys/dev/scsipi/atapi_wdc.c
--- a/sys/dev/scsipi/atapi_wdc.c        Tue Feb 11 15:11:27 2020 +0000
+++ b/sys/dev/scsipi/atapi_wdc.c        Wed Feb 12 00:19:07 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: atapi_wdc.c,v 1.134 2019/11/10 21:16:37 chs Exp $      */
+/*     $NetBSD: atapi_wdc.c,v 1.135 2020/02/12 00:19:07 chs Exp $      */
 
 /*
  * Copyright (c) 1998, 2001 Manuel Bouyer.
@@ -25,7 +25,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: atapi_wdc.c,v 1.134 2019/11/10 21:16:37 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: atapi_wdc.c,v 1.135 2020/02/12 00:19:07 chs Exp $");
 
 #ifndef ATADEBUG
 #define ATADEBUG
@@ -138,7 +138,7 @@
        chan->chan_flags = SCSIPI_CHAN_OPENINGS;
        chan->chan_openings = 1;
        chan->chan_max_periph = 1;
-       chan->chan_ntargets = 2;
+       chan->chan_ntargets = chp->ch_ndrives;
        chan->chan_nluns = 1;
 
        chp->atapibus = config_found_ia(ata_sc->sc_dev, "atapi", chan,