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sd-event: fix prepare priority queue comparison function

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Otherwise a disabled event source can get swapped with an enabled one
and cause a severe sd-event malfunction.

http://lists.freedesktop.org/archives/systemd-devel/2015-September/034356.html
This commit is contained in:
Krzysztof Kotlenga 2015-09-24 00:34:51 +02:00
parent 167e451c37
commit 8046c4576a
1 changed files with 6 additions and 6 deletions
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12
src/libsystemd/sd-event/sd-event.c
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@ -257,6 +257,12 @@ static int prepare_prioq_compare(const void *a, const void *b) {
assert(x->prepare);
assert(y->prepare);
/* Enabled ones first */
if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF)
return -1;
if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF)
return 1;
/* Move most recently prepared ones last, so that we can stop
* preparing as soon as we hit one that has already been
* prepared in the current iteration */
@ -265,12 +271,6 @@ static int prepare_prioq_compare(const void *a, const void *b) {
if (x->prepare_iteration > y->prepare_iteration)
return 1;
/* Enabled ones first */
if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF)
return -1;
if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF)
return 1;
/* Lower priority values first */
if (x->priority < y->priority)
return -1;