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bh=URgG/GQpF3hxWKP3cotTkm5KWSX2MRj+zKuw0yApTls=; b=f9CoLIEtf+tQvtVGsF5ytGuLZOGhV1jGKjKizRsNBXjNxb4A6ze9g2XwWi7yHSJL1+tXIf epXKBTSlycw4cpMri1LY0+m7amgdgj7j+g0ktKMIpXPUNfjNHny1jsVzph/ghIIfZNzB9P JP7O2czD8/7Vsj5u3QDGYySpoc/MoNA= X-MC-Unique: IDx7D9ygN06mMvLOfUanVA-1 From: P J P To: Peter Maydell , Paolo Bonzini Subject: [PATCH v4 9/9] memory: assert MemoryRegionOps callbacks are defined Date: Tue, 11 Aug 2020 17:11:33 +0530 Message-Id: <20200811114133.672647-10-ppandit@redhat.com> In-Reply-To: <20200811114133.672647-1-ppandit@redhat.com> References: <20200811114133.672647-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ppandit@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" From: Prasad J Pandit When registering a MemoryRegionOps object, assert that its read/write callback methods are defined. This avoids potential guest crash via a NULL pointer dereference. Suggested-by: Peter Maydell Reviewed-by: Li Qiang Reviewed-by: Peter Maydell Signed-off-by: Prasad J Pandit Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- softmmu/memory.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) Update v4: add Reviewed-by tag -> https://lists.nongnu.org/archive/html/qemu-devel/2020-07/msg05324.html diff --git a/softmmu/memory.c b/softmmu/memory.c index af25987518..1f4b37b3a6 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1485,7 +1485,13 @@ void memory_region_init_io(MemoryRegion *mr, uint64_t size) { memory_region_init(mr, owner, name, size); - mr->ops =3D ops ? ops : &unassigned_mem_ops; + if (ops) { + assert(ops->read || ops->read_with_attrs); + assert(ops->write || ops->write_with_attrs); + mr->ops =3D ops; + } else { + mr->ops =3D &unassigned_mem_ops; + } mr->opaque =3D opaque; mr->terminates =3D true; } @@ -1663,6 +1669,8 @@ void memory_region_init_rom_device_nomigrate(MemoryRe= gion *mr, { Error *err =3D NULL; assert(ops); + assert(ops->read || ops->read_with_attrs); + assert(ops->write || ops->write_with_attrs); memory_region_init(mr, owner, name, size); mr->ops =3D ops; mr->opaque =3D opaque; --=20 2.26.2