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BUG/MINOR: quic: fix BUG_ON() on Tx pkt alloc failure

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On quic_tx_packet allocation failure, it is possible to trigger BUG_ON()
crash on INITIAL packet building. This statement is responsible to
ensure INITIAL packets are padded to 1.200 bytes as required. If a
packet on higher encryption level allocation fails, PADDING frame cannot
properly encoded, despite the INITIAL packet properly built.

This crash happens due to qc_txb_store() invokation after quic_tx_packet
allocation failure to validate already built packets. However, this
statement is unneeded as qc_purge_tx_buf() is called just after. Simply
remove qc_txb_store() to fix this issue.

This was detected using -dMfail.

This should be backported up to 2.6.
This commit is contained in:
Amaury Denoyelle 2024-06-20 17:54:04 +02:00
parent 5718c67c19
commit d5376b7a87
1 changed files with 0 additions and 2 deletions
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2
src/quic_tx.c
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@ -584,8 +584,6 @@ static int qc_prep_pkts(struct quic_conn *qc, struct buffer *buf,
if (!cur_pkt) {
switch (err) {
case QC_BUILD_PKT_ERR_ALLOC:
if (first_pkt)
qc_txb_store(buf, dglen, first_pkt);
qc_purge_tx_buf(qc, buf);
break;