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Merge pull request #31263 from nalind/journal-doublefree 

Synchronize the cursor returned by followJournal
This commit is contained in:
Alexander Morozov 2017-02-22 17:45:49 -08:00 committed by GitHub
parent 1948cc5fac d57c330617
commit b3e7f70137
1 changed files with 5 additions and 0 deletions
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5
daemon/logger/journald/read.go
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@ -249,6 +249,8 @@ func (s *journald) followJournal(logWatcher *logger.LogWatcher, config logger.Re
s.readers.readers[logWatcher] = logWatcher
s.readers.mu.Unlock()
newCursor := make(chan *C.char)
go func() {
for {
// Keep copying journal data out until we're notified to stop
@ -276,6 +278,7 @@ func (s *journald) followJournal(logWatcher *logger.LogWatcher, config logger.Re
delete(s.readers.readers, logWatcher)
s.readers.mu.Unlock()
close(logWatcher.Msg)
newCursor <- cursor
}()
// Wait until we're told to stop.
@ -285,6 +288,8 @@ func (s *journald) followJournal(logWatcher *logger.LogWatcher, config logger.Re
C.close(pfd[1])
}
cursor = <-newCursor
return cursor
}