edc602651c
Commit 419ca82d57 (Fix m17n backspace handling causes out-of-bounds
write in checkType) introduced an incomplete fix.
In function checkType we store the length of the previous multi-char
character in a buffer plens_buffer with pointer plens pointing to the
current position inside the buffer. When encountering a backspace plens
is set to the previous position without a bounds check. This will lead
to plens being out of bounds if we get more backspaces than we have
processed multi-char characters before.
If we are at the beginning of the buffer do not decrement and set plen
(the current length) to 0.
This also fixes GH Issue #270 [BUG] Out of bound read in Strnew_size ,
Str.c:61
If the above explanation does sound weird it's because I didn't fully
grok that function. :-)
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41 KiB