id = 1412
title = "QEMU segfault (null pointer dereference) in sve_probe_page from ldff1* instructions"
state = "closed"
created_at = "2023-01-04T12:39:55.377Z"
closed_at = "2023-01-13T17:54:36.715Z"
labels = ["Closed::Fixed", "accel: TCG", "target: arm"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1412"
host-os = "Fedora 36"
host-arch = "x86"
qemu-version = "7.2.0"
guest-os = "n/a"
guest-arch = "AArch64"
description = """After upgrading to QEMU v7.2.0 from v7.1.0, when executing any SVE ldff1* instructions with a faulting address, QEMU crashes due to a null pointer dereference at target/arm/sve_helper.c:5364

I believe this was introduced in b8967ddf393aaf35fdbc07b4cb538a40f8b6fe37 (@rth7680), since in that commit `full` is dereferenced before the `flags & TLB_INVALID_MASK` check at line 5369, and full is set to null by `probe_access_full` when `TLB_INVALID_MASK` is given."""
reproduce = "n/a"
additional = "n/a"