| Message ID | 20170822142823.69425-1-nixiaoming@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 22.08.2017 16:28, nixiaoming wrote: > miss kfree(stt) when anon_inode_getfd return fail > so add check anon_inode_getfd return val, and kfree stt > > Signed-off-by: nixiaoming <nixiaoming@huawei.com> > --- > arch/powerpc/kvm/book3s_64_vio.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c > index a160c14..a0b4459 100644 > --- a/arch/powerpc/kvm/book3s_64_vio.c > +++ b/arch/powerpc/kvm/book3s_64_vio.c > @@ -341,8 +341,11 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, > > mutex_unlock(&kvm->lock); > > - return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, > + ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, > stt, O_RDWR | O_CLOEXEC); > + if (ret < 0) > + goto fail; > + return ret; > > fail: > if (stt) { > stt has already been added to kvm->arch.spapr_tce_tables, so freeing it is evil IMHO. I don't know that code, so I don't know if there is some other place that will make sure that everything in kvm->arch.spapr_tce_tables will properly get freed, even when no release function has been called (kvm_spapr_tce_release).
On 22.08.2017 17:15, David Hildenbrand wrote: > On 22.08.2017 16:28, nixiaoming wrote: >> miss kfree(stt) when anon_inode_getfd return fail >> so add check anon_inode_getfd return val, and kfree stt >> >> Signed-off-by: nixiaoming <nixiaoming@huawei.com> >> --- >> arch/powerpc/kvm/book3s_64_vio.c | 5 ++++- >> 1 file changed, 4 insertions(+), 1 deletion(-) >> >> diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c >> index a160c14..a0b4459 100644 >> --- a/arch/powerpc/kvm/book3s_64_vio.c >> +++ b/arch/powerpc/kvm/book3s_64_vio.c >> @@ -341,8 +341,11 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, >> >> mutex_unlock(&kvm->lock); >> >> - return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, >> + ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, >> stt, O_RDWR | O_CLOEXEC); >> + if (ret < 0) >> + goto fail; >> + return ret; >> >> fail: >> if (stt) { >> > > > stt has already been added to kvm->arch.spapr_tce_tables, so freeing it > is evil IMHO. I don't know that code, so I don't know if there is some > other place that will make sure that everything in > kvm->arch.spapr_tce_tables will properly get freed, even when no release > function has been called (kvm_spapr_tce_release). > If it is really not freed, than also kvm_put_kvm(stt->kvm) is missing.
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index a160c14..a0b4459 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -341,8 +341,11 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, mutex_unlock(&kvm->lock); - return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, + ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, stt, O_RDWR | O_CLOEXEC); + if (ret < 0) + goto fail; + return ret; fail: if (stt) {
miss kfree(stt) when anon_inode_getfd return fail so add check anon_inode_getfd return val, and kfree stt Signed-off-by: nixiaoming <nixiaoming@huawei.com> --- arch/powerpc/kvm/book3s_64_vio.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)