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0e69a38026
Problem: When an error line in a file passed to :cfile / :cgetfile is
longer than IOSIZE, qf_parse_file_pfx() copies the tail
into the fixed-size IObuff with STRMOVE(), overflowing the heap buffer.
The same code path can also loop indefinitely because
qf_parse_file_pfx() always returns QF_MULTISCAN when a
tail is present, and qf_init_ext() unconditionally goes
to "restofline" without bounding the tail length (Nabih).
Solution: Remove the STRMOVE() into IObuff. In the QF_MULTISCAN
branch, alias linebuf into the tail directly and update
linelen, requiring strict progress (new length less than
the previous length) before retrying; otherwise ignore
the line.
closes: vim/vim#20126
Supported by AI
77677c33de
Co-authored-by: Christian Brabandt <cb@256bit.org>