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Apply a timeout to reading the body when fetching a file. (#11784)

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This prevents the URL preview code from reading
a stream forever.
This commit is contained in:
Patrick Cloke 2022-01-24 09:38:37 -05:00 committed by GitHub
parent ec2271ac50
commit 02d99f044e
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2 changed files with 13 additions and 3 deletions
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1
changelog.d/11784.bugfix Normal file
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@ -0,0 +1 @@
Fix a long-standing bug that media streams could cause long-lived connections when generating URL previews.

15
synapse/http/client.py
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@ -731,15 +731,24 @@ class SimpleHttpClient:
# straight back in again
try:
length = await make_deferred_yieldable(
read_body_with_max_size(response, output_stream, max_size)
)
d = read_body_with_max_size(response, output_stream, max_size)
# Ensure that the body is not read forever.
d = timeout_deferred(d, 30, self.hs.get_reactor())
length = await make_deferred_yieldable(d)
except BodyExceededMaxSize:
raise SynapseError(
HTTPStatus.BAD_GATEWAY,
"Requested file is too large > %r bytes" % (max_size,),
Codes.TOO_LARGE,
)
except defer.TimeoutError:
raise SynapseError(
HTTPStatus.BAD_GATEWAY,
"Requested file took too long to download",
Codes.TOO_LARGE,
)
except Exception as e:
raise SynapseError(
HTTPStatus.BAD_GATEWAY, ("Failed to download remote body: %s" % e)