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From a5626cd14a7f27538033e1e110f9a827c0189526 Mon Sep 17 00:00:00 2001
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From: Krzysztof Kotlenga <k.kotlenga@sims.pl>
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Date: Thu, 24 Sep 2015 00:34:51 +0200
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Subject: [PATCH] sd-event: fix prepare priority queue comparison function
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Otherwise a disabled event source can get swapped with an enabled one
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and cause a severe sd-event malfunction.
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http://lists.freedesktop.org/archives/systemd-devel/2015-September/034356.html
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Cherry-picked from: 8046c4576a68977a1089d2585866bfab8152661b
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Resolves: #1266479
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---
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src/libsystemd/sd-event/sd-event.c | 12 ++++++------
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1 file changed, 6 insertions(+), 6 deletions(-)
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diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
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index c6350be..1f1e6fe 100644
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--- a/src/libsystemd/sd-event/sd-event.c
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+++ b/src/libsystemd/sd-event/sd-event.c
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@@ -231,6 +231,12 @@ static int prepare_prioq_compare(const void *a, const void *b) {
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assert(x->prepare);
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assert(y->prepare);
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+ /* Enabled ones first */
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+ if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF)
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+ return -1;
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+ if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF)
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+ return 1;
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+
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/* Move most recently prepared ones last, so that we can stop
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* preparing as soon as we hit one that has already been
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* prepared in the current iteration */
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@@ -239,12 +245,6 @@ static int prepare_prioq_compare(const void *a, const void *b) {
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if (x->prepare_iteration > y->prepare_iteration)
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return 1;
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- /* Enabled ones first */
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- if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF)
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- return -1;
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- if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF)
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- return 1;
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-
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/* Lower priority values first */
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if (x->priority < y->priority)
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return -1;
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