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authorRoel Kluin <roel.kluin@gmail.com>2009-08-07 10:39:25 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-08-07 10:40:40 +0200
commit53cb780adbe69df90c8dc23e992ce40455e687c3 (patch)
treecf6958d7b3f37eb5c89eadf97e2eecd4248814d6 /arch/s390/kvm
parent677c1dd706d9cc384730cbd52baf821923d8be9b (diff)
downloadlinux-linaro-android-53cb780adbe69df90c8dc23e992ce40455e687c3.tar.gz
[S390] KVM: Read buffer overflow
Check whether index is within bounds before testing the element. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/sigp.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index 36678835034..0ef81d6776e 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -169,7 +169,7 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
unsigned long *reg)
{
struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
- struct kvm_s390_local_interrupt *li;
+ struct kvm_s390_local_interrupt *li = NULL;
struct kvm_s390_interrupt_info *inti;
int rc;
u8 tmp;
@@ -189,9 +189,10 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
return 2; /* busy */
spin_lock(&fi->lock);
- li = fi->local_int[cpu_addr];
+ if (cpu_addr < KVM_MAX_VCPUS)
+ li = fi->local_int[cpu_addr];
- if ((cpu_addr >= KVM_MAX_VCPUS) || (li == NULL)) {
+ if (li == NULL) {
rc = 1; /* incorrect state */
*reg &= SIGP_STAT_INCORRECT_STATE;
kfree(inti);