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matroskadec: Fix overflow introduced in a569a7b3
This commit fixes an overflow introduced in a569a7b3
that affected EBML
elements that the Matroska demuxer doesn't want to parse like CRC-32
elements. The return value of avio_skip (the new position on success or
an AVERROR on failure) has been assigned to an integer which meant that
new positions in the range of 2GB to 4GB-1 etc. were considered errors.
Fixes ticket #8001.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
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parent
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@ -1259,12 +1259,13 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
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return 1;
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default:
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if (length) {
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int64_t res2;
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if (ffio_limit(pb, length) != length) {
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// ffio_limit emits its own error message,
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// so we don't have to.
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return AVERROR(EIO);
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}
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if ((res = avio_skip(pb, length - 1)) >= 0) {
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if ((res2 = avio_skip(pb, length - 1)) >= 0) {
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// avio_skip might take us past EOF. We check for this
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// by skipping only length - 1 bytes, reading a byte and
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// checking the error flags. This is done in order to check
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@ -1272,7 +1273,8 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
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// no filesize (that ffio_limit relies on) is available.
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avio_r8(pb);
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res = NEEDS_CHECKING;
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}
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} else
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res = res2;
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} else
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res = 0;
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}
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