diff options
| author | Eric Farman <farman@linux.ibm.com> | 2019-04-17 02:54:14 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2019-04-18 10:13:51 +0200 |
| commit | 58616e6a37842740349b7a42dc442ec50fc1d457 (patch) | |
| tree | db952e560235efde062736ec0586991871eaf7fa /arch/s390/kvm | |
| parent | 79a3aaa7b82e3106be97842dedfd8429248896e6 (diff) | |
KVM: s390: Fix potential spectre warnings
Fix some warnings from smatch:
arch/s390/kvm/interrupt.c:2310 get_io_adapter() warn: potential spectre issue 'kvm->arch.adapters' [r] (local cap)
arch/s390/kvm/interrupt.c:2341 register_io_adapter() warn: potential spectre issue 'dev->kvm->arch.adapters' [w]
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20190417005414.47801-1-farman@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 82162867f378..bfd55ad34a3e 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -14,6 +14,7 @@ #include <linux/kvm_host.h> #include <linux/hrtimer.h> #include <linux/mmu_context.h> +#include <linux/nospec.h> #include <linux/signal.h> #include <linux/slab.h> #include <linux/bitmap.h> @@ -2307,6 +2308,7 @@ static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id) { if (id >= MAX_S390_IO_ADAPTERS) return NULL; + id = array_index_nospec(id, MAX_S390_IO_ADAPTERS); return kvm->arch.adapters[id]; } @@ -2320,8 +2322,13 @@ static int register_io_adapter(struct kvm_device *dev, (void __user *)attr->addr, sizeof(adapter_info))) return -EFAULT; - if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) || - (dev->kvm->arch.adapters[adapter_info.id] != NULL)) + if (adapter_info.id >= MAX_S390_IO_ADAPTERS) + return -EINVAL; + + adapter_info.id = array_index_nospec(adapter_info.id, + MAX_S390_IO_ADAPTERS); + + if (dev->kvm->arch.adapters[adapter_info.id] != NULL) return -EINVAL; adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); |