id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
36768	Repetitive string concatentation (in a loop) in File.__iter__	wooseokdotkim	Varun Kasyap Pentamaraju	"I thought the code below could generate DoS, so I made a bug report
However, `File._iter__()` was not recognized as a bug because only one line was buffered and only worked for chunks returned from `File.chunks`, but it was determined that verification code for input should be added, so it was created as an open ticket.

The code pattern is similar to CVE-2023-36053, which is already released, so I think it needs to be modified.

code: django/core/files/base.py:89

{{{
def __iter__(self):
    buffer_ = None
    for chunk in self.chunks():
        for line in chunk.splitlines(True):
            if buffer_:
                line = buffer_ + line  # < Code!
}}}


How should I patch it?
"	Cleanup/optimization	closed	File uploads/storage	dev	Normal	fixed	concatenation	wooseokdotkim	Ready for checkin	1	0	0	0	0	0