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rtpst2022-1-fecenc: memset when reallocating xored payload

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When protecting packets with a variable payload length, we
reallocate the xored payload when needed. It is a good idea
to memset the extended memory to 0 so that we don't xor
data with garbage!

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/839>
This commit is contained in:
Mathieu Duponchelle 2020-12-12 04:00:41 +01:00 committed by GStreamer Merge Bot
parent 081509e030
commit 6d98415fd4
1 changed files with 9 additions and 6 deletions
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15
gst/rtpmanager/gstrtpst2022-1-fecenc.c
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@ -266,20 +266,23 @@ fec_packet_update (FecPacket * fec, GstRTPBuffer * rtp)
memcpy (fec->xored_payload, gst_rtp_buffer_get_payload (rtp), memcpy (fec->xored_payload, gst_rtp_buffer_get_payload (rtp),
fec->payload_len); fec->payload_len);
} else { } else {
if (fec->payload_len < gst_rtp_buffer_get_payload_len (rtp)) { guint plen = gst_rtp_buffer_get_payload_len (rtp);
fec->payload_len = gst_rtp_buffer_get_payload_len (rtp);
if (fec->payload_len < plen) {
fec->xored_payload = fec->xored_payload =
g_realloc (fec->xored_payload, sizeof (guint8) * fec->payload_len); g_realloc (fec->xored_payload, sizeof (guint8) * plen);
memset (fec->xored_payload + fec->payload_len, 0,
plen - fec->payload_len);
fec->payload_len = plen;
} }
fec->xored_payload_len ^= gst_rtp_buffer_get_payload_len (rtp); fec->xored_payload_len ^= plen;
fec->xored_pt ^= gst_rtp_buffer_get_payload_type (rtp); fec->xored_pt ^= gst_rtp_buffer_get_payload_type (rtp);
fec->xored_timestamp ^= gst_rtp_buffer_get_timestamp (rtp); fec->xored_timestamp ^= gst_rtp_buffer_get_timestamp (rtp);
_xor_mem (fec->xored_payload, gst_rtp_buffer_get_payload (rtp),
gst_rtp_buffer_get_payload_len (rtp));
fec->xored_marker ^= gst_rtp_buffer_get_marker (rtp); fec->xored_marker ^= gst_rtp_buffer_get_marker (rtp);
fec->xored_padding ^= gst_rtp_buffer_get_padding (rtp); fec->xored_padding ^= gst_rtp_buffer_get_padding (rtp);
fec->xored_extension ^= gst_rtp_buffer_get_extension (rtp); fec->xored_extension ^= gst_rtp_buffer_get_extension (rtp);
_xor_mem (fec->xored_payload, gst_rtp_buffer_get_payload (rtp), plen);
} }
fec->n_packets += 1; fec->n_packets += 1;