crash in ssl module #17719
Description
Port, board and/or hardware
unix, coverage build
MicroPython version
MicroPython v1.26.0-preview.387.g67acac257f.dirty on 2025-07-19; linux [GCC 12.2.0] version
Reproduction
Run the following code:
import io
import ssl
class TestSocket(io.IOBase):
def write(self, buf):
return len(buf)
def readinto(self, buf):
return 0
def ioctl(self, cmd, arg):
print("TestSocket.ioctl", cmd, arg)
return 0
def setblocking(self, value):
print("TestSocket.setblocking({})".format(value))
ss = ssl.wrap_socket(TestSocket(), server_side=1, do_handshake=0)
ss.close()
ss.setblocking(0)Expected behaviour
When calling setblocking on a closed ssl socket, no crash occurs
Observed behaviour
segmentation fault. gdb says
Program received signal SIGSEGV, Segmentation fault.
mp_obj_get_type (o_in=o_in@entry=0x0) at ../../py/obj.c:61
61 return o->type;
(gdb) where
#0 mp_obj_get_type (o_in=o_in@entry=0x0) at ../../py/obj.c:61
#1 0x00005555555e8ed0 in mp_load_method_maybe (obj=obj@entry=0x0,
attr=attr@entry=745, dest=dest@entry=0x7fffffffd870)
at ../../py/runtime.c:1196
#2 0x00005555555e96c6 in mp_load_method (base=0x0, attr=attr@entry=745,
dest=dest@entry=0x7fffffffd870) at ../../py/runtime.c:1239
#3 0x000055555563c7f2 in socket_setblocking (self_in=<optimized out>,
flag_in=0xe) at ../../extmod/modtls_mbedtls.c:778
Additional Information
This method, and perhaps other ones, needs to check for a NULL o->sock.
Code of Conduct
Yes, I agree