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Prevent freeing a possible invalid pointer from journald

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Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
(cherry picked from commit 81630df854)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>
This commit is contained in:
Kenfe-Mickael Laventure 2017-02-21 11:07:57 -08:00 • committed by Victor Vieux
parent 91d33f250b
commit 52a7b8350a
1 changed files with 5 additions and 3 deletions
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8
daemon/logger/journald/read.go
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@ -237,7 +237,10 @@ drain:
// free(NULL) is safe
C.free(unsafe.Pointer(oldCursor))
C.sd_journal_get_cursor(j, &cursor)
if C.sd_journal_get_cursor(j, &cursor) != 0 {
// ensure that we won't be freeing an address that's invalid
cursor = nil
}
return cursor
}
@ -264,7 +267,6 @@ func (s *journald) followJournal(logWatcher *logger.LogWatcher, config logger.Re
s.readers.mu.Lock()
delete(s.readers.readers, logWatcher)
s.readers.mu.Unlock()
C.sd_journal_close(j)
close(logWatcher.Msg)
}()
// Wait until we're told to stop.
@ -298,9 +300,9 @@ func (s *journald) readLogs(logWatcher *logger.LogWatcher, config logger.ReadCon
following := false
defer func(pfollowing *bool) {
if !*pfollowing {
C.sd_journal_close(j)
close(logWatcher.Msg)
}
C.sd_journal_close(j)
}(&following)
// Remove limits on the size of data items that we'll retrieve.
rc = C.sd_journal_set_data_threshold(j, C.size_t(0))