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[Qemu-commits] [qemu/qemu] a9197a: kvm: fix segfault with query-stats-sc

From: Richard Henderson
Subject: [Qemu-commits] [qemu/qemu] a9197a: kvm: fix segfault with query-stats-schemas and -M ...
Date: Fri, 19 Aug 2022 09:30:02 -0700

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: a9197ad2101cfc885cc316af299f49ba89039e54
  Author: Paolo Bonzini <pbonzini@redhat.com>
  Date:   2022-08-18 (Thu, 18 Aug 2022)

  Changed paths:
    M accel/kvm/kvm-all.c

  Log Message:
  kvm: fix segfault with query-stats-schemas and -M none

-M none creates a guest without a vCPU, causing the following error:

$ ./qemu-system-x86_64 -qmp stdio -M none -accel kvm
{"return": {}}
{execute: query-stats-schemas}
Segmentation fault (core dumped)

Fix it by not querying the vCPU stats if first_cpu is NULL.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

  Commit: a78241a62b55b202b29f3b190bdca3c3a425e693
  Author: Richard Henderson <richard.henderson@linaro.org>
  Date:   2022-08-19 (Fri, 19 Aug 2022)

  Changed paths:
    M accel/kvm/kvm-all.c

  Log Message:
  Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

Fix SIGSEGV with query-stats-schema.

This allows management tools to query the statistics schemas without
worrying that some versions of QEMU will crash.

# iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmL/U90UHHBib256aW5p
# QHJlZGhhdC5jb20ACgkQv/vSX3jHroN93gf/Q9pye7bA436FsMujHgaspp7asI0z
# MHgs1anNSEoRrogIqw595Blyt7ILGvEe333rpDqg23W52/NVn+R0qdiTeg/lG/Zm
# zDLCT8T9CrJZEJvmRora6JPapjrsXRiXsDCkhi8ClqoEPm1X/rDCRMtxpOKJzk5E
# dZTLZcy6FVtcNroqx2BzAJiDcXlby6H92LTXmBRFK6jesst9nj4wvZLiDhsLBEte
# PdVXbxCV85OKRng55c9wyFuthkAi7UtRCYrgjPSDqCe/UnnscVPYEDQElMfmf8Ts
# DL7vQ0MZy8F9hVd851Mu57uKeYVenAETNEs/P9qfwo1ANPizqcB+ACYoBA==
# =LX7e
# gpg: Signature made Fri 19 Aug 2022 02:11:57 AM PDT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [undefined]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  kvm: fix segfault with query-stats-schemas and -M none

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Compare: https://github.com/qemu/qemu/compare/976a55c0fe42...a78241a62b55

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