Fix bug #17881 with infloop in decoding emacs-mule encoded text.

 src/coding.c (MIN_CHARBUF_SIZE): Enlarge to 32.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 5dbaf96840a..85a50dad91f 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -7266,7 +7266,8 @@ produce_charset (struct coding_system *coding, int *charbuf, ptrdiff_t pos)
 }
 
 #define MAX_CHARBUF_SIZE 0x4000
-#define MIN_CHARBUF_SIZE 0x10
+/* emacs-mule decoding requires more than 16 bytes.  */
+#define MIN_CHARBUF_SIZE 0x20
 
 #define ALLOC_CONVERSION_WORK_AREA(coding, size)                \
   do {                                                          \