curl: Make socket callback during cleanup into no-op #3307
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Because curl_multi_cleanup may invoke callbacks, we effectively have some circular references going on here. See discussion in curl/curl#14860 Basically what we do is the socket callback libcurl may invoke into a no-op when we detect we're finalizing. The data structures are owned by this object and not by the callbacks, and will be destroyed below. Note that e.g. g_hash_table_unref() may itself invoke callbacks, which is where some data is cleaned up. Signed-off-by: Colin Walters <[email protected]>
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For people who are distributing ostree: in my opinion this patch is quite safe to cherry pick. The affected code here is during the teardown path and we're just making a called function into a no-op, so realistically the worst case is memory leaks. But for leaks: ASAN is still happy with this change, and from my auditing of the code again we're always relying on our own teardown, not on the libcurl socket callback. |
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Because curl_multi_cleanup may invoke callbacks, we effectively have
some circular references going on here. See discussion in
curl/curl#14860
Basically what we do is the socket callback libcurl may invoke into a no-op when
we detect we're finalizing. The data structures are owned by this object and
not by the callbacks, and will be destroyed below. Note that
e.g. g_hash_table_unref() may itself invoke callbacks, which is where
some data is cleaned up.
Signed-off-by: Colin Walters [email protected]
Closes: #3299