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wtv: Add more sanity checks for a length read from the file
Also make sure the existing length check can't overflow. Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC: libav-stable@libav.org Signed-off-by: Martin Storsjö <martin@martin.st>
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@ -269,7 +269,12 @@ static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int b
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dir_length = AV_RL16(buf + 16);
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file_length = AV_RL64(buf + 24);
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name_size = 2 * AV_RL32(buf + 32);
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if (buf + 48 + name_size > buf_end) {
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if (name_size < 0) {
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av_log(s, AV_LOG_ERROR,
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"bad filename length, remaining directory entries ignored\n");
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break;
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}
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if (48 + name_size > buf_end - buf) {
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av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
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break;
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}
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