From: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
To: Gautam Menghani <gautam@linux.ibm.com>,
maddy@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au,
chleroy@kernel.org, sshegde@linux.ibm.com,
amachhiw@linux.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v3 3/4] KVM: PPC: Book3S HV: XICS: Avoid NULL ptr deref in kvmppc_xive_cleanup_vcpu()
Date: Fri, 30 Oct 2026 19:26:01 +0530 [thread overview]
Message-ID: <8q3fwavi.ritesh.list@gmail.com> (raw)
In-Reply-To: <20261012082922.218799-4-gautam@linux.ibm.com>
Gautam Menghani <gautam@linux.ibm.com> writes:
> In kvmppc_xive_connect_vcpu() if there is a failure before
> xc->vp_ipi_data is setup, it can result in a NULL pointer dereference in
> kvmppc_xive_cleanup_vcpu() when accessing the MMIO page in
> xive_vm_esb_load(). Fix this by adding a check before masking
> the VP IPI before accessing the MMIO pages.
>
> Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
> Cc: stable@vger.kernel.org # 4.12+
> Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
> ---
> v3:
> 1. Add some more info to the patch description.
>
> v2:
> 1. New patch - Introduced to fix the scenario where NULL ptr deref is
> possible. (Sashiko)
>
Make sense. However, the order of patch-2 and patch-3 should be
reversed. Otherwise LGTM.
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
next prev parent reply other threads:[~2026-10-30 13:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-12 8:29 [PATCH v3 0/4] Fixes for KVM HV around synchronization and initializations Gautam Menghani
2026-10-12 8:29 ` [PATCH v3 1/4] KVM: PPC: Book3S HV: Ensure that calls to idr_alloc are synchronized Gautam Menghani
2026-10-12 8:29 ` [PATCH v3 2/4] KVM: PPC: Book3S HV: XICS: Update irq_type for cleanup to work Gautam Menghani
2026-10-30 13:13 ` Ritesh Harjani
2026-10-12 8:29 ` [PATCH v3 3/4] KVM: PPC: Book3S HV: XICS: Avoid NULL ptr deref in kvmppc_xive_cleanup_vcpu() Gautam Menghani
2026-10-30 13:56 ` Ritesh Harjani [this message]
2026-10-12 8:29 ` [PATCH v3 4/4] KVM: PPC: Book3S HV: Take SRCU read lock around kvmppc_h_page_init() call Gautam Menghani
2026-10-13 14:31 ` Ritesh Harjani
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8q3fwavi.ritesh.list@gmail.com \
--to=ritesh.list@gmail.com \
--cc=amachhiw@linux.ibm.com \
--cc=chleroy@kernel.org \
--cc=gautam@linux.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=maddy@linux.ibm.com \
--cc=mpe@ellerman.id.au \
--cc=npiggin@gmail.com \
--cc=sshegde@linux.ibm.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox