diff mbox

[1/3] hw/misc/arm_sysctl: Fix bad boundary check on mb clock accesses

Message ID 1392647854-8067-2-git-send-email-peter.maydell@linaro.org
State Superseded
Headers show

Commit Message

Peter Maydell Feb. 17, 2014, 2:37 p.m. UTC 
Fix incorrect use of sizeof() rather than ARRAY_SIZE() to guard
accesses into the mb_clock[] array, which was allowing a malicious
guest to overwrite the end of the array.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/misc/arm_sysctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/hw/misc/arm_sysctl.c b/hw/misc/arm_sysctl.c
index 0fc26d2..3fad6f8 100644
--- a/hw/misc/arm_sysctl.c
+++ b/hw/misc/arm_sysctl.c
@@ -276,7 +276,7 @@  static bool vexpress_cfgctrl_read(arm_sysctl_state *s, unsigned int dcc,
         }
         break;
     case SYS_CFG_OSC:
-        if (site == SYS_CFG_SITE_MB && device < sizeof(s->mb_clock)) {
+        if (site == SYS_CFG_SITE_MB && device < ARRAY_SIZE(s->mb_clock)) {
             /* motherboard clock */
             *val = s->mb_clock[device];
             return true;
@@ -324,7 +324,7 @@  static bool vexpress_cfgctrl_write(arm_sysctl_state *s, unsigned int dcc,
 
     switch (function) {
     case SYS_CFG_OSC:
-        if (site == SYS_CFG_SITE_MB && device < sizeof(s->mb_clock)) {
+        if (site == SYS_CFG_SITE_MB && device < ARRAY_SIZE(s->mb_clock)) {
             /* motherboard clock */
             s->mb_clock[device] = val;
             return true;