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From 24267889a717e1e799037a0f1841d5416eb56e75 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
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Date: Mon, 30 May 2022 10:15:37 +0300
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Subject: [PATCH 3/4] qtdemux: Fix integer overflows in zlib decompression code
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Various variables were of smaller types than needed and there were no
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checks for any overflows when doing additions on the sizes. This is all
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checked now.
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In addition the size of the decompressed data is limited to 200MB now as
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any larger sizes are likely pathological and we can avoid out of memory
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situations in many cases like this.
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Also fix a bug where the available output size on the next iteration in
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the zlib decompression code was provided too large and could
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potentially lead to out of bound writes.
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Thanks to Adam Doupe for analyzing and reporting the issue.
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CVE: tbd
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https://gstreamer.freedesktop.org/security/sa-2022-0003.html
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Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1225
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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2610>
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---
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gst/isomp4/qtdemux.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/gst/isomp4/qtdemux.c b/gst/isomp4/qtdemux.c
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index 182d0bc06f..a9cbbd4cd3 100644
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--- a/gst/isomp4/qtdemux.c
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+++ b/gst/isomp4/qtdemux.c
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@@ -7611,10 +7611,16 @@ qtdemux_inflate (void *z_buffer, guint z_length, guint * length)
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break;
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}
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+ if (*length > G_MAXUINT - 4096 || *length > QTDEMUX_MAX_SAMPLE_INDEX_SIZE) {
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+ GST_WARNING ("too big decompressed data");
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+ ret = Z_MEM_ERROR;
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+ break;
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+ }
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+
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*length += 4096;
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buffer = (guint8 *) g_realloc (buffer, *length);
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z.next_out = (Bytef *) (buffer + z.total_out);
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- z.avail_out += 4096;
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+ z.avail_out += *length - z.total_out;
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} while (z.avail_in > 0);
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if (ret != Z_STREAM_END) {
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--
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2.38.1
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