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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1787307777; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=+ur991tHo8Q0ICY7xQl3xXfWPIxu2WHRhGHu/pcI4S8=; b=WzplPUvRo4qOnN6h4urdEH4o43kkNNHZPenI+iFhlf1Ko0Xq1q8U5dHD2Prag/r4qc9JMC Q6ijoBsMt8vVm/aHBuC082dXyAaUuSccF1bDgIugLFd3x3ZdRpVxIj9oMJimUZRFKn9TbW 3cyeHJLub0ufaDBiz8cr2WaK8U3ootE= X-MC-Unique: 2OampVpaOgqgCzvqCw33iw-1 X-Mimecast-MFC-AGG-ID: 2OampVpaOgqgCzvqCw33iw_1787307775 To: devel@lists.libvirt.org Subject: [libvirt PATCH] qemu: agent: clear stale pointer in qemuAgentGetDisks Date: Fri, 21 Aug 2026 12:22:35 +0200 Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: _AOp20E9TeiGdKda5higLY79KbX5wc84f0UP7bHUy00_1787307775 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID-Hash: KLCMJ5SWBVJSGOD5CWX4SCBQSOUHV5R7 X-Message-ID-Hash: KLCMJ5SWBVJSGOD5CWX4SCBQSOUHV5R7 X-MailFrom: jtomko@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.lists.libvirt.org-0; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list List-Id: Development discussions about the libvirt library & tools Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: =?utf-8?q?J=C3=A1n_Tomko_via_Devel?= Reply-To: =?UTF-8?q?J=C3=A1n=20Tomko?= X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1787307853720158500 From: J=C3=A1n Tomko CVE-2026-77158 In case of hitting the cleanup label, the disks array was freed but the pointer was not cleared, leading to a possible double free. Fixes: 0cb2d9f05d00497a715352f6ea28cf8fb6921731 (v6.10.0-9-g0cb2d9f05d) Closes: https://gitlab.com/libvirt/libvirt/-/work_items/910 Reported-by: David Korczynski (Ada Logics) Found-by: Claude Signed-off-by: J=C3=A1n Tomko Reviewed-by: Peter Krempa --- src/hypervisor/qemu_agent.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/hypervisor/qemu_agent.c b/src/hypervisor/qemu_agent.c index f5f50e3c92..431407b68e 100644 --- a/src/hypervisor/qemu_agent.c +++ b/src/hypervisor/qemu_agent.c @@ -2562,7 +2562,7 @@ int qemuAgentGetDisks(qemuAgent *agent, for (i =3D 0; i < ndata; i++) { qemuAgentDiskInfoFree((*disks)[i]); } - g_free(*disks); + g_clear_pointer(disks, g_free); return -1; } =20 --=20 2.55.0