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target-arm: Fix potential buffer overflow 

Report from smatch:

target-arm/helper.c:651 arm946_prbs_read(6) error:
 buffer overflow 'env->cp15.c6_region' 8 <= 8
target-arm/helper.c:661 arm946_prbs_write(6) error:
 buffer overflow 'env->cp15.c6_region' 8 <= 8

c7_region is an array with 8 elements, so the index must be less than 8.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Stefan Weil 2012-09-04 07:35:57 +02:00 committed by Aurelien Jarno
parent 149eeb5fe5
commit 599d64f6dc
1 changed files with 2 additions and 2 deletions
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4
target-arm/helper.c
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@ -645,7 +645,7 @@ static int pmsav5_insn_ap_read(CPUARMState *env, const ARMCPRegInfo *ri,
static int arm946_prbs_read(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t *value)
{
if (ri->crm > 8) {
if (ri->crm >= 8) {
return EXCP_UDEF;
}
*value = env->cp15.c6_region[ri->crm];
@ -655,7 +655,7 @@ static int arm946_prbs_read(CPUARMState *env, const ARMCPRegInfo *ri,
static int arm946_prbs_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
{
if (ri->crm > 8) {
if (ri->crm >= 8) {
return EXCP_UDEF;
}
env->cp15.c6_region[ri->crm] = value;