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MDEV-40176: UBSAN: runtime error: applying non-zero offset in my_charpos_mb #5291

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Merged
grooverdan merged 2 commits into from
Jun 29, 2026
+3 −3
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MDEV-40176: UBSAN: runtime error: applying non-zero offset in my_charpos_mb #5291

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06ae6b7
MDEV-40176: UBSAN: runtime error: applying non-zero offset in `my_cha…
raghunandanbhat Jun 29, 2026
7513fb6
MDEV-40176: UBSAN: runtime error: applying non-zero offset in `my_cha…
grooverdan Jun 29, 2026
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6 changes: 3 additions & 3 deletions strings/ctype-mb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -301,7 +301,7 @@ int my_wildcmp_mb(CHARSET_INFO *cs,
}


size_t my_numchars_mb(CHARSET_INFO *cs __attribute__((unused)),
size_t my_numchars_mb(CHARSET_INFO *cs,
const char *pos, const char *end)
{
register size_t count= 0;
Expand All @@ -315,7 +315,7 @@ size_t my_numchars_mb(CHARSET_INFO *cs __attribute__((unused)),
}


size_t my_charpos_mb(CHARSET_INFO *cs __attribute__((unused)),
size_t my_charpos_mb(CHARSET_INFO *cs,
const char *pos, const char *end, size_t length)
{
const char *start= pos;
Expand All @@ -326,7 +326,7 @@ size_t my_charpos_mb(CHARSET_INFO *cs __attribute__((unused)),
pos+= (mb_len= my_ismbchar(cs, pos, end)) ? mb_len : 1;
length--;
}
return (size_t) (length ? end+2-start : pos-start);
return (size_t) (length ? (end-start)+2 : pos-start);
}


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