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selftests: net: devlink_port_split: check devlink returned an element before dereferencing it

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And thus avoid a Python stacktrace:

~/linux/tools/testing/selftests/net$ ./devlink_port_split.py
Traceback (most recent call last):
  File "/home/linux/tools/testing/selftests/net/./devlink_port_split.py",
line 277, in <module> main()
  File "/home/linux/tools/testing/selftests/net/./devlink_port_split.py",
line 242, in main
    dev = list(devs.keys())[0]
IndexError: list index out of range

Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Pisati 2021-06-28 16:54:24 +02:00 • committed by David S. Miller
parent b856150c80
commit a118ff6618
1 changed files with 3 additions and 0 deletions
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3
tools/testing/selftests/net/devlink_port_split.py
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@ -239,6 +239,9 @@ def main(cmdline=None):
assert stderr == ""
devs = json.loads(stdout)['dev']
if len(devs.keys()) == 0:
print("no devlink device found")
sys.exit(1)
dev = list(devs.keys())[0]
cmd = "devlink dev show %s" % dev