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BUG/MINOR: mux-quic: check access on qcs stream-endpoint

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Since the following commit, allocation of stream-endpoint has been
delayed. The objective is to allocate it only for QCS attached to an
upper stream object.

  commit e6064c561684d9b079e3b5725d38dc3b5c1b5cd5
  OPTIM: mux-quic: delay FE sedesc alloc to stream creation

However, some MUX functions are unsafe as qcs->sd is dereferenced
without any check on it which will result in a crash. Fix this by
testing that qcs->sd is allocated before using it.

This does not need to be backported, unless the above patch is.
This commit is contained in:
Amaury Denoyelle 2025-11-21 11:06:38 +01:00
parent 91f479604e
commit bbd83e3de9
1 changed files with 12 additions and 10 deletions
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22
src/mux_quic.c
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@ -2237,16 +2237,18 @@ int qcc_recv_stop_sending(struct qcc *qcc, uint64_t id, uint64_t err)
}
}
/* Manually set EOS if FIN already reached as futures RESET_STREAM will be ignored in this case. */
if (qcs_sc(qcs) && se_fl_test(qcs->sd, SE_FL_EOI)) {
se_fl_set(qcs->sd, SE_FL_EOS);
qcs_alert(qcs);
}
if (qcs->sd) {
/* Manually set EOS if FIN already reached as futures RESET_STREAM will be ignored in this case. */
if (qcs_sc(qcs) && se_fl_test(qcs->sd, SE_FL_EOI)) {
se_fl_set(qcs->sd, SE_FL_EOS);
qcs_alert(qcs);
}
/* If not defined yet, set abort info for the sedesc */
if (!qcs->sd->abort_info.info) {
qcs->sd->abort_info.info = (SE_ABRT_SRC_MUX_QUIC << SE_ABRT_SRC_SHIFT);
qcs->sd->abort_info.code = err;
/* If not defined yet, set abort info for the sedesc */
if (!qcs->sd->abort_info.info) {
qcs->sd->abort_info.info = (SE_ABRT_SRC_MUX_QUIC << SE_ABRT_SRC_SHIFT);
qcs->sd->abort_info.code = err;
}
}
/* RFC 9000 3.5. Solicited State Transitions
@ -3075,7 +3077,7 @@ static void qcc_wait_for_hs(struct qcc *qcc)
node = eb64_first(&qcc->streams_by_id);
while (node) {
qcs = container_of(node, struct qcs, by_id);
if (se_fl_test(qcs->sd, SE_FL_WAIT_FOR_HS))
if (qcs_sc(qcs) && se_fl_test(qcs->sd, SE_FL_WAIT_FOR_HS))
qcs_notify_recv(qcs);
node = eb64_next(node);
}