[src/trunk]: src/sys/dev Avoid undefined behavior. Found by KUBSan.

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

details:   https://anonhg.NetBSD.org/src/rev/74cc7cb4389c
branches:  trunk
changeset: 457968:74cc7cb4389c
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Thu Jul 25 14:31:35 2019 +0000

description:
Avoid undefined behavior. Found by KUBSan.

diffstat:

 sys/dev/ic/rtwnreg.h   |  5 +++--
 sys/dev/usb/if_urtwn.c |  8 ++++----
 2 files changed, 7 insertions(+), 6 deletions(-)

diffs (53 lines):

diff -r 6a0712c6c3d6 -r 74cc7cb4389c sys/dev/ic/rtwnreg.h
--- a/sys/dev/ic/rtwnreg.h      Thu Jul 25 13:16:35 2019 +0000
+++ b/sys/dev/ic/rtwnreg.h      Thu Jul 25 14:31:35 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rtwnreg.h,v 1.1 2018/06/29 04:02:10 thorpej Exp $      */
+/*     $NetBSD: rtwnreg.h,v 1.2 2019/07/25 14:31:35 msaitoh Exp $      */
 /*     $OpenBSD: r92creg.h,v 1.16 2017/09/22 13:41:56 kevlo Exp $      */
 
 /*-
@@ -1031,7 +1031,8 @@
 
 /* Macros to access unaligned little-endian memory. */
 #define LE_READ_2(x)   ((x)[0] | ((x)[1] << 8))
-#define LE_READ_4(x)   ((x)[0] | ((x)[1] << 8) | ((x)[2] << 16) | ((x)[3] << 24))
+#define LE_READ_4(x)   ((x)[0] | ((x)[1] << 8) | ((x)[2] << 16) | \
+           ((uint32_t)((x)[3]) << 24))
 
 /*
  * Macros to access subfields in registers.
diff -r 6a0712c6c3d6 -r 74cc7cb4389c sys/dev/usb/if_urtwn.c
--- a/sys/dev/usb/if_urtwn.c    Thu Jul 25 13:16:35 2019 +0000
+++ b/sys/dev/usb/if_urtwn.c    Thu Jul 25 14:31:35 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_urtwn.c,v 1.70 2019/06/15 04:00:17 msaitoh Exp $    */
+/*     $NetBSD: if_urtwn.c,v 1.71 2019/07/25 14:31:35 msaitoh Exp $    */
 /*     $OpenBSD: if_urtwn.c,v 1.42 2015/02/10 23:25:46 mpi Exp $       */
 
 /*-
@@ -25,7 +25,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_urtwn.c,v 1.70 2019/06/15 04:00:17 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_urtwn.c,v 1.71 2019/07/25 14:31:35 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -1092,13 +1092,13 @@
                            &cp[1], 2);
                        urtwn_write_4(sc, R92C_HMEBOX(fwcur),
                            cp[0] + (cp[3] << 8) + (cp[4] << 16) +
-                           (cp[5] << 24));
+                           ((uint32_t)cp[5] << 24));
                } else {
                        urtwn_write_region(sc, R92E_HMEBOX_EXT(fwcur),
                            &cp[4], 2);
                        urtwn_write_4(sc, R92C_HMEBOX(fwcur),
                            cp[0] + (cp[1] << 8) + (cp[2] << 16) +
-                           (cp[3] << 24));
+                           ((uint32_t)cp[3] << 24));
                }
        } else {
                urtwn_write_region(sc, R92C_HMEBOX(fwcur), cp, len);