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added check if the buf is at least RECORD_HEADER_SZ #7638

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merged 2 commits into from
Jun 13, 2024
Merged

added check if the buf is at least RECORD_HEADER_SZ #7638

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845e2f7
added check if the buf is at least RECORD_HEADER_SZ
gasbytes Jun 11, 2024
88527a3
word32 -> sword32
gasbytes Jun 13, 2024
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11 changes: 11 additions & 0 deletions src/quic.c
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Original file line number Diff line number Diff line change
Expand Up @@ -197,6 +197,12 @@ static word32 quic_record_transfer(QuicRecord* qr, byte* buf, word32 sz)
if (len <= 0) {
return 0;
}

/* We check if the buf is at least RECORD_HEADER_SZ */
if (sz < RECORD_HEADER_SZ) {
return -1;
}

if (qr->rec_hdr_remain == 0) {
/* start a new TLS record */
rlen = (qr->len <= (word32)MAX_RECORD_SIZE) ?
Expand Down Expand Up @@ -774,6 +780,11 @@ int wolfSSL_quic_receive(WOLFSSL* ssl, byte* buf, word32 sz)
n = 0;
if (ssl->quic.input_head) {
n = quic_record_transfer(ssl->quic.input_head, buf, sz);

/* record too small to be fit into a RecordLayerHeader struct. */
if (n == -1) {
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n is unsigned here -- but there's a bigger problem, quic_record_transfer() is returning unsigned (word32), but it's returning -1 to signify error.

so you'll need to fix quic_record_transfer() to return sword32, fix signedness clashes that arise from that, and change n in wolfSSL_quic_receive() to be an sword32 and fix clashes that arise from that.

I'm quite surprised none of the analyzers are warning us about return -1 from word32 quic_record_transfer().

return -1;
}
if (quic_record_done(ssl->quic.input_head)) {
QuicRecord* qr = ssl->quic.input_head;
ssl->quic.input_head = qr->next;
Expand Down
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