I tracked it down further today, accidentally finding a reproducer. In
methods/http.cc we check for Req.DownloadSize > Req.MaximumSize and fail
with an error if that's the case; hence ensuring our download was within
the allowed range for the request.
The issue is that Req.MaximumSize is calculated by
BaseHttpMethod::FindMaximumObjectSizeInQueue as the maximum of all
maximum sizes in the queue; and requests with unknown sizes are encoded
as 0, so FindMaximumObjectSizeInQueue() will return any other size that
is not 0, despite the 0 meaning "unknown". The fix is to return 0 if any
maximum size is 0.
** Also affects: apt (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Hirsute)
Importance: Undecided
Status: Triaged
** Also affects: apt (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Focal)
Importance: Undecided
Status: New
** Summary changed:
- apt install - File has unexpected size - http pipeline
+ size mismatch error if request of unknown size is larger than others
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https://bugs.launchpad.net/bugs/1921626
Title:
size mismatch error if request of unknown size is larger than others
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