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BUG: Hang in StringDType UTF-8 decoder on malformed input. #32287
Description
Describe the issue:
Red Hat Product Security has asked me to forward the attached report upstream.
Reproduce the code example:
import numpy as np
b = np.array([b"\x80AAAA"], dtype="|S5")
s = b.astype(np.dtypes.StringDType())
np.strings.slice(s, 0, 3, 1)Error message:
(hang)
Top of GDB backtrace:
slice_strided_loop (context=<optimized out>, data=<optimized out>,
dimensions=<optimized out>, strides=<optimized out>,
__NPY_UNUSED_TAGGEDauxdata=<optimized out>)
at ../numpy/_core/src/umath/stringdtype_ufuncs.cpp:2255
2255 codepoint_offsets.push_back((unsigned char *)inbuf_ptr);
(gdb) bt
#0 slice_strided_loop (context=<optimized out>, data=<optimized out>,
dimensions=<optimized out>, strides=<optimized out>,
__NPY_UNUSED_TAGGEDauxdata=<optimized out>)
at ../numpy/_core/src/umath/stringdtype_ufuncs.cpp:2255
#1 0x00007fffe86423b8 in try_trivial_single_output_loop (
context=0x7fffffffca40, op=0x7fffffffca98, order=NPY_KEEPORDER,
errormask=521) at ../numpy/_core/src/umath/ufunc_object.c:982
#2 PyUFunc_GenericFunctionInternal (ufunc=<optimized out>,
ufuncimpl=<optimized out>, operation_descrs=0x7fffffffcaf0,
op=0x7fffffffca98, casting=NPY_SAME_KIND_CASTING, order=NPY_KEEPORDER,
wheremask=<optimized out>) at ../numpy/_core/src/umath/ufunc_object.c:2248
#3 ufunc_generic_fastcall (ufunc=<optimized out>, args=<optimized out>,
len_args=<optimized out>, kwnames=<optimized out>, outer=<optimized out>)
at ../numpy/_core/src/umath/ufunc_object.c:4723Python and NumPy Versions:
Python 3.14.6 running numpy 2.4.6
Runtime Environment:
No response
How does this issue affect you or how did you find it:
I've been advised to include this message: Found by AISLE in partnership with Red Hat
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