77 lines
2.2 KiB
Diff
77 lines
2.2 KiB
Diff
From 478653961d090f868521e8513518fe8d7c67cba3 Mon Sep 17 00:00:00 2001
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From: Wim Taymans <wtaymans@redhat.com>
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Date: Mon, 16 Dec 2024 11:26:07 +0100
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Subject: [PATCH 7/8] vorbis_parse: check writes to
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GstOggStream.vorbis_mode_sizes
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Thanks to Antonio Morales for finding and reporting the issue.
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Fixes GHSL-2024-117 Fixes gstreamer#3875
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Also perform out-of-bounds check for accesses to op->packet
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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8097>
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---
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ext/ogg/vorbis_parse.c | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/ext/ogg/vorbis_parse.c b/ext/ogg/vorbis_parse.c
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index 2d85e9397..df52f7eb5 100644
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--- a/ext/ogg/vorbis_parse.c
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+++ b/ext/ogg/vorbis_parse.c
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@@ -165,6 +165,10 @@ gst_parse_vorbis_setup_packet (GstOggStream * pad, ogg_packet * op)
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if (offset == 0) {
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offset = 8;
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current_pos -= 1;
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+
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+ /* have we underrun? */
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+ if (current_pos < op->packet)
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+ return -1;
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}
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}
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@@ -178,6 +182,10 @@ gst_parse_vorbis_setup_packet (GstOggStream * pad, ogg_packet * op)
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if (offset == 7)
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current_pos -= 1;
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+ /* have we underrun? */
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+ if (current_pos < op->packet + 5)
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+ return -1;
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+
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if (((current_pos[-5] & ~((1 << (offset + 1)) - 1)) != 0)
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||
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current_pos[-4] != 0
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@@ -199,9 +207,18 @@ gst_parse_vorbis_setup_packet (GstOggStream * pad, ogg_packet * op)
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/* Give ourselves a chance to recover if we went back too far by using
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* the size check. */
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for (ii = 0; ii < 2; ii++) {
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+
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if (offset > 4) {
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+ /* have we underrun? */
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+ if (current_pos < op->packet)
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+ return -1;
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+
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size_check = (current_pos[0] >> (offset - 5)) & 0x3F;
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} else {
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+ /* have we underrun? */
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+ if (current_pos < op->packet + 1)
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+ return -1;
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+
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/* mask part of byte from current_pos */
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size_check = (current_pos[0] & ((1 << (offset + 1)) - 1));
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/* shift to appropriate position */
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@@ -229,6 +246,10 @@ gst_parse_vorbis_setup_packet (GstOggStream * pad, ogg_packet * op)
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mode_size_ptr = pad->vorbis_mode_sizes;
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+ if (size > G_N_ELEMENTS (pad->vorbis_mode_sizes)) {
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+ return -1;
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+ }
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+
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for (i = 0; i < size; i++) {
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offset = (offset + 1) % 8;
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if (offset == 0)
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--
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2.47.0
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