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MDEV-24335 Unexpected question mark in the end of a TINYTEXT column

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my_copy_fix_mb() passed MIN(src_length,dst_length) to
my_append_fix_badly_formed_tail(). It could break a multi-byte
character in the middle, which put the question mark to the
destination.

Fixing the code to pass the true src_length to
my_append_fix_badly_formed_tail().
This commit is contained in:
Alexander Barkov
2021-11-02 09:00:49 +04:00
parent 026984c360
commit d0b611a76d
3 changed files with 22 additions and 2 deletions
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4
strings/ctype-mb.c
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@@ -401,10 +401,10 @@ my_copy_fix_mb(CHARSET_INFO *cs,
size_t well_formed_nchars;
size_t well_formed_length;
size_t fixed_length;
size_t min_length= MY_MIN(src_length, dst_length);
set_if_smaller(src_length, dst_length);
well_formed_nchars= cs->cset->well_formed_char_length(cs,
src, src + src_length,
src, src + min_length,
nchars, status);
DBUG_ASSERT(well_formed_nchars <= nchars);
well_formed_length= status->m_source_end_pos - src;