BUG: CSV file with carriage return breaks pandas

[pgdr]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

[.../pd]$ python3 -m venv e
[.../pd]$ source e/bin/activate
(e) [.../pd]$ pip install pandas
...
Successfully installed numpy-1.24.1 pandas-1.5.3 python-dateutil-2.8.2 pytz-2022.7.1 six-1.16.0
(e) [.../pd]$ wget https://gist.githubusercontent.com/pgdr/e6c6ad236666909426cf841fe2704050/raw/cd0910f56ec3791fe0fd1679e426424fcdb39c24/mwe.csv
...
(e) [.../pd]$ python
Python 3.8.10 (default, Nov 14 2022, 12:59:47)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
>>> len(pandas.read_csv("mwe.csv"))
<stdin>:1: DtypeWarning: Columns (1,4,5) have mixed types. Specify dtype option on import or set low_memory=False.
131073
>>>
(e) [.../pd]$ wc mwe.csv
  3   4 195 mwe.csv
(e) [.../pd]$ nano mwe.csv  # delete _any_ character before CR
(e) [.../pd]$ wc mwe.csv
  3   4 194 mwe.csv
(e) [.../pd]$ python
Python 3.8.10 (default, Nov 14 2022, 12:59:47)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
>>> len(pandas.read_csv("mwe.csv"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/scratch/pd/e/lib/python3.8/site-packages/pandas/util/_decorators.py", line 211, in wrapper
    return func(*args, **kwargs)
  File "/scratch/pd/e/lib/python3.8/site-packages/pandas/util/_decorators.py", line 331, in wrapper
    return func(*args, **kwargs)
  File "/scratch/pd/e/lib/python3.8/site-packages/pandas/io/parsers/readers.py", line 950, in read_csv
    return _read(filepath_or_buffer, kwds)
  File "/scratch/pd/e/lib/python3.8/site-packages/pandas/io/parsers/readers.py", line 611, in _read
    return parser.read(nrows)
  File "/scratch/pd/e/lib/python3.8/site-packages/pandas/io/parsers/readers.py", line 1778, in read
    ) = self._engine.read(  # type: ignore[attr-defined]
  File "/scratch/pd/e/lib/python3.8/site-packages/pandas/io/parsers/c_parser_wrapper.py", line 230, in read
    chunks = self._reader.read_low_memory(nrows)
  File "pandas/_libs/parsers.pyx", line 808, in pandas._libs.parsers.TextReader.read_low_memory
  File "pandas/_libs/parsers.pyx", line 866, in pandas._libs.parsers.TextReader._read_rows
  File "pandas/_libs/parsers.pyx", line 852, in pandas._libs.parsers.TextReader._tokenize_rows
  File "pandas/_libs/parsers.pyx", line 1973, in pandas._libs.parsers.raise_parser_error
pandas.errors.ParserError: Error tokenizing data. C error: Buffer overflow caught - possible malformed input file.

Issue Description

The file in the gist at pgdr#e6c6ad236666909426cf841fe2704050 is a CSV file mwe.csv with 3 lines and 195 characters, of which one is a carriage return.

The CSV file is "broken" so it is fine that Pandas doesn't open it correctly.

However, when parsed with read_csv, pandas returns a dataframe with 131071 rows!

In addition, if you delete any one character from the file, the result is

Error tokenizing data. C error: Buffer overflow caught - possible malformed input file.

Expected Behavior

Do not buffer overflow

Installed Versions

INSTALLED VERSIONS

commit : f06c96a
python : 3.8.10.final.0
python-bits : 64
OS : Linux
OS-release : 5.4.0-137-generic
Version : #154-Ubuntu SMP Thu Jan 5 17:03:22 UTC 2023
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_DK.UTF-8
LOCALE : en_DK.UTF-8

pandas : 2.0.0.dev0+1401.gf06c96a93f
numpy : 1.24.1
pytz : 2022.7.1
dateutil : 2.8.2
setuptools : 44.0.0
pip : 20.0.2

[rmhowe425]

take

[rmhowe425]

take

[topper-123]

Thanks for the bug report @pgdr.

This example should fail also. Probably something to do with our use of regexes.

A PR would be welcome.

[topper-123]

Possibly related to #40587.