zeertzjq 9d7544ac4c vim-patch:9.0.2143: [security]: buffer-overflow in ex_substitute ...

Problem:  [security]: buffer-overflow in ex_substitute
Solution: clear memory after allocating

When allocating the new_start pointer in ex_substitute() the memory
pointer points to some garbage that the following for loop in
ex_cmds.c:4743 confuses and causes it to accessing the new_start pointer
beyond it's size, leading to a buffer-overlow.

So fix this by using alloc_clear() instead of alloc(), which will
clear the memory by NUL and therefore cause the loop to terminate
correctly.

Reported by @henices, thanks!

closes: vim/vim#13596

abfa13ebe9

Co-authored-by: Christian Brabandt <cb@256bit.org>

2023-12-02 10:41:31 +08:00

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