check that ']' exists in ranges_overlap() before trying backup

1 files changed, 2 insertions, 2 deletions

diff --git a/URPM.xs b/URPM.xs
index 23d1f89..1b17ba2 100644
--- a/URPM.xs
+++ b/URPM.xs
@@ -352,8 +352,8 @@ ranges_overlap(uint32_t aflags, char *sa, uint32_t bflags, char *sb) {
     EVR_t lEVR = rpmEVRnew(aflags, 0),
           rEVR = rpmEVRnew(bflags, 0);
 
-    backup_char(eosa);
-    backup_char(eosb);
+    if(eosa) backup_char(eosa);
+    if(eosb) backup_char(eosb);
     rpmEVRparse(sa, lEVR);
     rpmEVRparse(sb, rEVR);
     /* TODO: upstream bug? should rpmEVRparse really reset Flags? */