Protect the bidi iterator against zero bidi properties.

 src/bidi.c (bidi_get_type): If bidi_type_table reports zero as the
 character bidirectional type, use STRONG_L instead.  Fixes crashes
 in a buffer produced by `describe-categories'.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/bidi.c b/src/bidi.c
index c0eee33ab3f..7517eca5aed 100644
--- a/src/bidi.c
+++ b/src/bidi.c
@@ -108,6 +108,8 @@ bidi_get_type (int ch, bidi_dir_t override)
     abort ();
 
   default_type = (bidi_type_t) XINT (CHAR_TABLE_REF (bidi_type_table, ch));
+  if (default_type == 0)
+    default_type = STRONG_L;
 
   if (override == NEUTRAL_DIR)
     return default_type;