lav-outils/ffmpeg-patch/0001-libavformat-ffmetadec-use-dynamic-allocation-for-lin.patch

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2019-01-16 12:21:51 +01:00
From 1b016179fc18059382f8e047552e7031855764a0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Revol?= <revol@free.fr>
Date: Wed, 7 Nov 2018 14:31:04 +0100
Subject: [PATCH] libavformat/ffmetadec: use dynamic allocation for line buffer
When adding thumbnails to OGG files, the line can easily go up to 100kB.
We thus try to allocate the file size or SIZE_MAX to avoid truncation.
---
libavformat/ffmetadec.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/libavformat/ffmetadec.c b/libavformat/ffmetadec.c
index 3290b3b7bc..ccbff51c03 100644
--- a/libavformat/ffmetadec.c
+++ b/libavformat/ffmetadec.c
@@ -128,16 +128,26 @@ static int read_tag(const uint8_t *line, AVDictionary **m)
static int read_header(AVFormatContext *s)
{
AVDictionary **m = &s->metadata;
- uint8_t line[1024];
+ int64_t line_size = avio_size(s->pb);
+ uint8_t *line;
+
+ if (line_size < 1 || line_size > SIZE_MAX)
+ line_size = SIZE_MAX;
+
+ line = av_malloc(line_size);
+ if (!line)
+ return AVERROR(ENOMEM);
while(!avio_feof(s->pb)) {
- get_line(s->pb, line, sizeof(line));
+ get_line(s->pb, line, line_size);
if (!memcmp(line, ID_STREAM, strlen(ID_STREAM))) {
AVStream *st = avformat_new_stream(s, NULL);
- if (!st)
+ if (!st) {
+ av_free(line);
return AVERROR(ENOMEM);
+ }
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = AV_CODEC_ID_FFMETADATA;
@@ -146,8 +156,10 @@ static int read_header(AVFormatContext *s)
} else if (!memcmp(line, ID_CHAPTER, strlen(ID_CHAPTER))) {
AVChapter *ch = read_chapter(s);
- if (!ch)
+ if (!ch) {
+ av_free(line);
return AVERROR(ENOMEM);
+ }
m = &ch->metadata;
} else
@@ -160,6 +172,7 @@ static int read_header(AVFormatContext *s)
s->chapters[s->nb_chapters - 1]->time_base,
AV_TIME_BASE_Q);
+ av_free(line);
return 0;
}
--
2.19.1