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[PATCH] accel/kvm: Check ioctl(KVM_SET_USER_MEMORY_REGION) return value
From: |
Philippe Mathieu-Daudé |
Subject: |
[PATCH] accel/kvm: Check ioctl(KVM_SET_USER_MEMORY_REGION) return value |
Date: |
Fri, 21 Feb 2020 17:33:36 +0100 |
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 <address@hidden>
---
accel/kvm/kvm-all.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
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;
}
--
2.21.1
- [PATCH] accel/kvm: Check ioctl(KVM_SET_USER_MEMORY_REGION) return value,
Philippe Mathieu-Daudé <=