From 88cd34ee9e8866a27d99766fd384ed92e6e31d60 Mon Sep 17 00:00:00 2001 From: Philippe Mathieu-Daudé Date: Fri, 21 Feb 2020 17:33:36 +0100 Subject: accel/kvm: Check ioctl(KVM_SET_USER_MEMORY_REGION) return value kvm_vm_ioctl() can fail, check its return value, and log an error when it failed. This fixes Coverity CID 1412229: Unchecked return value (CHECKED_RETURN) check_return: Calling kvm_vm_ioctl without checking return value Reported-by: Coverity (CID 1412229) Fixes: 235e8982ad3 ("support using KVM_MEM_READONLY flag for regions") Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Peter Xu Message-Id: <20200221163336.2362-1-philmd@redhat.com> Signed-off-by: Paolo Bonzini --- accel/kvm/kvm-all.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'accel/kvm') diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index c111312dfd..6df3a4d030 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -308,13 +308,23 @@ static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot, boo /* Set the slot size to 0 before setting the slot to the desired * value. This is needed based on KVM commit 75d61fbc. */ mem.memory_size = 0; - kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); + ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); + if (ret < 0) { + goto err; + } } mem.memory_size = slot->memory_size; ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); slot->old_flags = mem.flags; +err: trace_kvm_set_user_memory(mem.slot, mem.flags, mem.guest_phys_addr, mem.memory_size, mem.userspace_addr, ret); + if (ret < 0) { + error_report("%s: KVM_SET_USER_MEMORY_REGION failed, slot=%d," + " start=0x%" PRIx64 ", size=0x%" PRIx64 ": %s", + __func__, mem.slot, slot->start_addr, + (uint64_t)mem.memory_size, strerror(errno)); + } return ret; } -- cgit v1.2.3-55-g7522