Fix for bug #31069: crash in 'sounds like'

and for bug #31070: crash during conversion of charsets

Problem: passing a 0 byte length string to some my_mb_wc_XXX() 
functions leads to server crash due to improper argument check.

Fix: properly check arguments passed to my_mb_wc_XXX() functions.


mysql-test/include/ctype_common.inc:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - test case.
mysql-test/r/ctype_big5.result:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - test result.
mysql-test/r/ctype_euckr.result:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - test result.
mysql-test/r/ctype_gb2312.result:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - test result.
mysql-test/r/ctype_gbk.result:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - test result.
mysql-test/r/ctype_uca.result:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - test result.
strings/ctype-big5.c:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - check the string length before testing its first byte.
strings/ctype-cp932.c:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - check the string length before testing its first byte.
strings/ctype-euc_kr.c:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - check the string length before testing its first byte.
strings/ctype-gb2312.c:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - check the string length before testing its first byte.
strings/ctype-sjis.c:
  Fix for bug #31069: crash in 'sounds like'
  and bug #31070: crash during conversion of charsets
    - check the string length before testing its first byte.

1 files changed, 2 insertions, 2 deletions

diff --git a/strings/ctype-euc_kr.c b/strings/ctype-euc_kr.c
index 25ac416ac60..50300f3c140 100644
--- a/strings/ctype-euc_kr.c
+++ b/strings/ctype-euc_kr.c
@@ -8614,12 +8614,12 @@ my_mb_wc_euc_kr(CHARSET_INFO *cs __attribute__((unused)),
 		 my_wc_t *pwc, const uchar *s, const uchar *e)
 {
   
-  int hi=s[0];
+  int hi;
   
   if (s >= e)
     return MY_CS_TOOSMALL;
   
-  if (hi<0x80)
+  if ((hi= s[0]) < 0x80)
   {
     pwc[0]=hi;
     return 1;