[FFmpeg-cvslog] Fix several security issues in matroskadec.c (MSVR-11-0080).
Michael Niedermayer
git at videolan.org
Wed Sep 7 15:16:21 CEST 2011
ffmpeg | branch: release/0.7 | Michael Niedermayer <michaelni at gmx.at> | Thu Jul 28 14:59:54 2011 +0200| [7e33a66c0e178c3576c1ba1648be4295809adca8] | committer: Michael Niedermayer
Fix several security issues in matroskadec.c (MSVR-11-0080).
Whitespace of the patch cleaned up by Aurel
Some of the issues have been reported by Steve Manzuik / Microsoft Vulnerability Research (MSVR)
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 956c901c68eff78288f40e3c8f41ee2fa081d4a8)
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7e33a66c0e178c3576c1ba1648be4295809adca8
---
libavformat/matroskadec.c | 32 ++++++++++++++++++++++++--------
1 files changed, 24 insertions(+), 8 deletions(-)
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index f0fa4da..0451071 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -826,11 +826,15 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
uint32_t id = syntax->id;
uint64_t length;
int res;
+ void *newelem;
data = (char *)data + syntax->data_offset;
if (syntax->list_elem_size) {
EbmlList *list = data;
- list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
+ newelem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
+ if (!newelem)
+ return AVERROR(ENOMEM);
+ list->elem = newelem;
data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
memset(data, 0, syntax->list_elem_size);
list->nb_elem++;
@@ -992,7 +996,10 @@ static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
pkt_data = av_realloc(pkt_data, pkt_size);
zstream.avail_out = pkt_size - zstream.total_out;
zstream.next_out = pkt_data + zstream.total_out;
- result = inflate(&zstream, Z_NO_FLUSH);
+ if (pkt_data) {
+ result = inflate(&zstream, Z_NO_FLUSH);
+ } else
+ result = Z_MEM_ERROR;
} while (result==Z_OK && pkt_size<10000000);
pkt_size = zstream.total_out;
inflateEnd(&zstream);
@@ -1013,7 +1020,10 @@ static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
pkt_data = av_realloc(pkt_data, pkt_size);
bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
bzstream.next_out = pkt_data + bzstream.total_out_lo32;
- result = BZ2_bzDecompress(&bzstream);
+ if (pkt_data) {
+ result = BZ2_bzDecompress(&bzstream);
+ } else
+ result = BZ_MEM_ERROR;
} while (result==BZ_OK && pkt_size<10000000);
pkt_size = bzstream.total_out_lo32;
BZ2_bzDecompressEnd(&bzstream);
@@ -1066,13 +1076,17 @@ static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
}
}
-static void matroska_merge_packets(AVPacket *out, AVPacket *in)
+static int matroska_merge_packets(AVPacket *out, AVPacket *in)
{
- out->data = av_realloc(out->data, out->size+in->size);
+ void *newdata = av_realloc(out->data, out->size+in->size);
+ if (!newdata)
+ return AVERROR(ENOMEM);
+ out->data = newdata;
memcpy(out->data+out->size, in->data, in->size);
out->size += in->size;
av_destruct_packet(in);
av_free(in);
+ return 0;
}
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
@@ -1626,11 +1640,13 @@ static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
av_free(matroska->packets[0]);
if (matroska->num_packets > 1) {
+ void *newpackets;
memmove(&matroska->packets[0], &matroska->packets[1],
(matroska->num_packets - 1) * sizeof(AVPacket *));
- matroska->packets =
- av_realloc(matroska->packets, (matroska->num_packets - 1) *
- sizeof(AVPacket *));
+ newpackets = av_realloc(matroska->packets,
+ (matroska->num_packets - 1) * sizeof(AVPacket *));
+ if (newpackets)
+ matroska->packets = newpackets;
} else {
av_freep(&matroska->packets);
}
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