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| author | Matt Wolenetz <wolenetz@google.com> | 2019-07-25 15:54:49 -0700 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-01 12:11:55 +0200 |
| commit | debbbb5ba67be364db327dddb5b3cf559f1a07bd (patch) | |
| tree | 806a62c700143bf8d514f3fbfe816ec5f8bab677 | |
| parent | 50fbf1041426855aa40f3f0c2c5ce2b0a90f9b9d (diff) | |
| download | ffmpeg-debbbb5ba67be364db327dddb5b3cf559f1a07bd.tar.gz | |
lafv/wavdec: Fail bext parsing on incomplete reads
avio_read can successfully return even when less than the requested
amount of input was read. wavdec's bext parsing mistakenly assumed a
successful avio_read always read the full amount that was requested.
The result could be dictionary tags populated with partially
uninitialized values.
This change also fixes a broken assertion in wav_parse_bext_string that
was off-by-one, though no known current usage of that method hits that
broken case.
Chromium bug: 987270
Signed-off-by: Matt Wolenetz <wolenetz@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 052d41377a02f480f8e7135c0f7d418e9a405215)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/wavdec.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c index 8bbb301afc..15d6a6908f 100644 --- a/libavformat/wavdec.c +++ b/libavformat/wavdec.c @@ -230,9 +230,9 @@ static inline int wav_parse_bext_string(AVFormatContext *s, const char *key, char temp[257]; int ret; - av_assert0(length <= sizeof(temp)); - if ((ret = avio_read(s->pb, temp, length)) < 0) - return ret; + av_assert0(length < sizeof(temp)); + if ((ret = avio_read(s->pb, temp, length)) != length) + return ret < 0 ? ret : AVERROR_INVALIDDATA; temp[length] = 0; @@ -301,8 +301,10 @@ static int wav_parse_bext_tag(AVFormatContext *s, int64_t size) if (!(coding_history = av_malloc(size + 1))) return AVERROR(ENOMEM); - if ((ret = avio_read(s->pb, coding_history, size)) < 0) - return ret; + if ((ret = avio_read(s->pb, coding_history, size)) != size) { + av_free(coding_history); + return ret < 0 ? ret : AVERROR_INVALIDDATA; + } coding_history[size] = 0; if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history, |