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056fdd97d6
Problem: Problem with initializing the length of range() lists
Solution: Set length explicitly when it shouldn't contain any items
range() may cause a wrong calculation of list length, which may later
then cause a segfault in list_find(). This is usually not a problem,
because range_list_materialize() calculates the length, when it
materializes the list.
In addition, in list_find() when the length of the range was wrongly
initialized, it may seem to be valid, so the check for list index
out-of-bounds will not be true, because it is called before the list is
actually materialized. And so we may eventually try to access a null
pointer, causing a segfault.
So this patch does 3 things:
- In f_range(), when we know that the list should be empty, explicitly
set the list->lv_len value to zero. This should happen, when
start is larger than end (in case the stride is positive) or
end is larger than start when the stride is negative.
This should fix the underlying issue properly. However,
- as a safety measure, let's check that the requested index is not
out of range one more time, after the list has been materialized
and return NULL in case it suddenly is.
- add a few more tests to verify the behaviour.
fixes: vim/vim#13557
closes: vim/vim#13563
--------
Vim9 (non) materialize list is N/A.
Port only tests.
df63da98d8
Co-authored-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Tim Pope <tpope@github.com>
Neovim is a project that seeks to aggressively refactor Vim in order to:
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See the Introduction wiki page and Roadmap for more information.
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