[issue36819] Crash during encoding using UTF-16/32 and custom error handler
STINNER Victor
report at bugs.python.org
Wed Sep 29 03:35:23 EDT 2021
STINNER Victor <vstinner at python.org> added the comment:
> We could just forbid error handlers returning position not in the range (start , end]
Yeah, that sounds like a reasonable solution. I don't see the point of returning a position outside this range. What would be the use case?
For me, the only corner case is the "ignore" error handler which returns an empty string, but it returns a position in this range, no?
> it can break some code, so it is better to do this only in a new release.
Implementing custom error handlers is a rare use case, so it should only affect a minority of users. Moreover, IMO returning a position outside the valid range is a bug. It's common that security fixes change the behavior, like rejecting values which were previously acceptd, to prevent a Python crash.
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<https://bugs.python.org/issue36819>
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