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| author | Roel Kluin <roel.kluin@gmail.com> | 2009-08-07 12:39:25 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-08-07 12:40:40 +0400 |
| commit | 53cb780adbe69df90c8dc23e992ce40455e687c3 (patch) | |
| tree | cf6958d7b3f37eb5c89eadf97e2eecd4248814d6 /arch | |
| parent | 677c1dd706d9cc384730cbd52baf821923d8be9b (diff) | |
| download | linux-53cb780adbe69df90c8dc23e992ce40455e687c3.tar.xz | |
[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')
| -rw-r--r-- | arch/s390/kvm/sigp.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index 36678835034d..0ef81d6776e9 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); |