dvdnav: check pgcn validity before starting a pgc walk.

(cherry picked from commit c76baf650f2dbbe201453429fa4da74c5178632f)

1 files changed, 6 insertions, 0 deletions

diff --git a/libhb/dvdnav.c b/libhb/dvdnav.c
index b8c281197..b9ad5cd63 100644
--- a/libhb/dvdnav.c
+++ b/libhb/dvdnav.c
@@ -2087,6 +2087,12 @@ static int TitleOpenIfo(hb_dvdnav_t * d, int t)
         }
     }
 
+    /* Check pgc */
+    if ( d->pgcn < 1 || d->pgcn > d->ifo->vts_pgcit->nr_of_pgci_srp || d->pgcn >= MAX_PGCN)
+    {
+        hb_log( "invalid PGC ID %d for title %d, skipping", pgcn, t );
+        goto fail;
+    }
 
     /* Chapters */
     d->list_dvd_chapter = hb_list_init();