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fix: avoid memory leak when decoding invalid nested arrays (#671)

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Thomas Kowalski 2026-05-27 11:04:24 +02:00 • committed by GitHub
parent 378edc60f1
commit 4a07745675
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3 changed files with 44 additions and 0 deletions
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1
msgpack/_unpacker.pyx
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@ -322,6 +322,7 @@ cdef class Unpacker:
self.buf = NULL
def __dealloc__(self):
unpack_clear(&self.ctx)
PyMem_Free(self.buf)
self.buf = NULL

8
msgpack/unpack_template.h
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@ -72,6 +72,14 @@ static inline PyObject* unpack_data(unpack_context* ctx)
static inline void unpack_clear(unpack_context *ctx)
{
unsigned int i;
for (i = 1; i < ctx->top; i++) {
Py_CLEAR(ctx->stack[i].obj);
/* map_key holds a live reference only while waiting for the value */
if (ctx->stack[i].ct == CT_MAP_VALUE) {
Py_CLEAR(ctx->stack[i].map_key);
}
}
Py_CLEAR(ctx->stack[0].obj);
}