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From 90dedb47d2cb060a366d12bf467f03fa20c5ed24 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Thu, 17 Jan 2019 18:14:17 +0100
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Subject: [PATCH] sd-bus: reorder bus ref and bus message ref handling
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Let's always place handling of these references together, so that all
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reference counting during allocation is at a single place.
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(cherry picked from commit e593b6a87a335267e5f7238b14683b7f840a01a3)
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Related: CVE-2020-1712
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---
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src/libsystemd/sd-bus/bus-message.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/libsystemd/sd-bus/bus-message.c b/src/libsystemd/sd-bus/bus-message.c
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index 53cbd675b7..2ea3c5bba9 100644
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--- a/src/libsystemd/sd-bus/bus-message.c
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+++ b/src/libsystemd/sd-bus/bus-message.c
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@@ -461,7 +461,6 @@ int bus_message_from_header(
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if (!m)
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return -ENOMEM;
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- m->n_ref = 1;
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m->sealed = true;
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m->header = header;
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m->header_accessible = header_accessible;
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@@ -515,7 +514,9 @@ int bus_message_from_header(
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m->creds.mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
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}
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+ m->n_ref = 1;
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m->bus = sd_bus_ref(bus);
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+
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*ret = TAKE_PTR(m);
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return 0;
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@@ -588,13 +589,13 @@ _public_ int sd_bus_message_new(
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return -ENOMEM;
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t->n_ref = 1;
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+ t->bus = sd_bus_ref(bus);
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t->header = (struct bus_header*) ((uint8_t*) t + ALIGN(sizeof(struct sd_bus_message)));
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t->header->endian = BUS_NATIVE_ENDIAN;
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t->header->type = type;
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t->header->version = bus->message_version;
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t->allow_fds = bus->can_fds || !IN_SET(bus->state, BUS_HELLO, BUS_RUNNING);
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t->root_container.need_offsets = BUS_MESSAGE_IS_GVARIANT(t);
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- t->bus = sd_bus_ref(bus);
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if (bus->allow_interactive_authorization)
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t->header->flags |= BUS_MESSAGE_ALLOW_INTERACTIVE_AUTHORIZATION;
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