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avformat/asfdec_f: Fix overflow check in get_tag() 

Fixes: signed integer overflow: 2 * 1210064928 cannot be represented in type 'int'
Fixes: 20873/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5761116909338624

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-03-15 17:26:51 +01:00
parent 559ce9c845
commit c8140fe732
1 changed files with 13 additions and 2 deletions
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15
libavformat/asfdec_f.c
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@ -321,8 +321,7 @@ static void get_tag(AVFormatContext *s, const char *key, int type, int len, int
int64_t off = avio_tell(s->pb);
#define LEN 22
if ((unsigned)len >= (UINT_MAX - LEN) / 2)
return;
av_assert0((unsigned)len < (INT_MAX - LEN) / 2);
if (!asf->export_xmp && !strncmp(key, "xmp", 3))
goto finish;
@ -712,6 +711,9 @@ static int asf_read_metadata(AVFormatContext *s, int64_t size)
value_type = avio_rl16(pb); /* value_type */
value_len = avio_rl32(pb);
if (value_len < 0 || value_len > UINT16_MAX)
return AVERROR_INVALIDDATA;
name_len_utf8 = 2*name_len_utf16 + 1;
name = av_malloc(name_len_utf8);
if (!name)
@ -857,11 +859,20 @@ static int asf_read_header(AVFormatContext *s)
return ret;
av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size);
av_packet_unref(&pkt);
len= avio_rl32(pb);
if (len > UINT16_MAX)
return AVERROR_INVALIDDATA;
get_tag(s, "ASF_Protection_Type", -1, len, 32);
len= avio_rl32(pb);
if (len > UINT16_MAX)
return AVERROR_INVALIDDATA;
get_tag(s, "ASF_Key_ID", -1, len, 32);
len= avio_rl32(pb);
if (len > UINT16_MAX)
return AVERROR_INVALIDDATA;
get_tag(s, "ASF_License_URL", -1, len, 32);
} else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
av_log(s, AV_LOG_WARNING,