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7d76ffb2a4
CIDs tree is now allocated dynamically since the following commit :
276697438d
MINOR: quic: Use a pool for the connection ID tree.
This can caused a crash if qc_new_conn() is interrupted due to an
intermediary failed allocation. When freeing all connection members,
free_quic_conn_cids() is used. However, this function does not support a
NULL cids.
To fix this, simply check that cids is NULL during free_quic_conn_cids()
prologue.
This bug was reproduced using -dMfail.
No need to backport.