Ensure DB4 backend dbconns memory is initialised to zero

  Change to using calloc to allocate the memory for the dbconns array,
  as this will ensure that all the pointers in it are NULL which
  prevents us segfaulting on abnormal cleanup. Fixes the segfault from
  Debian bug #520117 but not the underlying issue.

diff --git a/keydb_db4.c b/keydb_db4.c
index e9dd5093d81f34511decf6629d9a3828f2923e7b..899075868b4d48df44cb4a49e2e6c03bcb1fb913 100644 (file)
--- a/keydb_db4.c
+++ b/keydb_db4.c
@@ -314,7 +314,7 @@ static void db4_initdb(bool readonly)
                }
        }
 
-       dbconns = malloc(sizeof (DB *) * numdbs);
+       dbconns = calloc(numdbs, sizeof (DB *));
        if (dbconns == NULL) {
                logthing(LOGTHING_CRITICAL,
                                "Couldn't allocate memory for dbconns");