[src/trunk]: src/sys/arch/arm/broadcom Limit number of words we read..

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

details:   https://anonhg.NetBSD.org/src/rev/dc5b185bc91e
branches:  trunk
changeset: 350236:dc5b185bc91e
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jan 08 05:04:45 2017 +0000

description:
Limit number of words we read..

diffstat:

 sys/arch/arm/broadcom/bcm53xx_rng.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (29 lines):

diff -r fa6c39e497a0 -r dc5b185bc91e sys/arch/arm/broadcom/bcm53xx_rng.c
--- a/sys/arch/arm/broadcom/bcm53xx_rng.c       Sun Jan 08 05:02:08 2017 +0000
+++ b/sys/arch/arm/broadcom/bcm53xx_rng.c       Sun Jan 08 05:04:45 2017 +0000
@@ -33,7 +33,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(1, "$NetBSD: bcm53xx_rng.c,v 1.8 2015/04/13 21:18:40 riastradh Exp $");
+__KERNEL_RCSID(1, "$NetBSD: bcm53xx_rng.c,v 1.9 2017/01/08 05:04:45 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -163,13 +163,14 @@
 bcmrng_empty(struct bcmrng_softc *sc)
 {
        mutex_enter(sc->sc_lock);
+       uint32_t data[128];
        size_t nwords = __SHIFTOUT(bcmrng_read_4(sc, RNG_STATUS), RNG_VAL);
        if (nwords == 0) {
                mutex_exit(sc->sc_lock);
                return 0;
        }
-
-       uint32_t data[nwords];
+       if (nwords > __arraycount(data))
+               nords = __arraycount(data);
 
        bcmrng_read_multi_4(sc, RNG_DATA, data, nwords);