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Subject: Re: [FFmpeg-devel] [PATCH v2] libavformat/dashdec: Fix buffer
overflow in segment URL resolution
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xiaohuanshu@gmail.com:
> From: xiaohuanshu <xiaohuanshu@gmail.com>
>
> Problem:
> The max_url_size calculation for DASH segment URLs only considered the base URL
> length, leading to buffer overflow when the segment's sourceURL exceeded the
> pre-allocated buffer. This triggered the log error:
> "DASH request for url 'invalid:truncated'".
>
> Reproduce:
> 1. A test sample "long-sourceurl-sample.mpd" (deliberately designed with a long
> sourceURL) was uploaded to VideoLAN's repository.
> 2. Reproduce with short base path:
> ffmpeg -i /tmp/short_path/long-sourceurl-sample.mpd
> -> Triggers "invalid:truncated" error
> 3. With artificially lengthened base path (e.g. /aaa/../bbb/../...):
> ffmpeg -i /long/../path/../with/../many/../segments/long-sourceurl-sample.mpd
> -> URL resolves correctly (though HTTP fetch fails due to fake URL)
>
> Fix:
> Recalculate max_url_size by considering both base URL and sourceURL lengths,
> ensuring sufficient buffer allocation during URL concatenation.
>
> V2:
> 1. no need to determine whether initialization_val is null.
> 2. fix the incorrect variable name.
>
> Signed-off-by: xiaohuanshu <xiaohuanshu@gmail.com>
> ---
> libavformat/dashdec.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
> index c3f3d7f3f8..a574c91932 100644
> --- a/libavformat/dashdec.c
> +++ b/libavformat/dashdec.c
> @@ -606,7 +606,7 @@ static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representati
> char *initialization_val = NULL;
> char *media_val = NULL;
> char *range_val = NULL;
> - int max_url_size = c ? c->max_url_size: MAX_URL_SIZE;
> + int max_url_size = 0;
This should use way smaller scope.
> int err;
>
> if (!av_strcasecmp(fragmenturl_node->name, "Initialization")) {
> @@ -620,6 +620,12 @@ static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representati
> xmlFree(initialization_val);
> return AVERROR(ENOMEM);
> }
> + max_url_size = FFMAX(
> + c ? c->max_url_size : 0,
> + aligned(strlen(initialization_val) +
> + (rep_id_val ? strlen(rep_id_val) : 0) +
> + (rep_bandwidth_val ? strlen(rep_bandwidth_val) : 0)));
> + max_url_size = max_url_size ? max_url_size : MAX_URL_SIZE;
> rep->init_section->url = get_content_url(baseurl_nodes, 4,
> max_url_size,
> rep_id_val,
> @@ -641,6 +647,11 @@ static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representati
> xmlFree(media_val);
> return AVERROR(ENOMEM);
> }
> + max_url_size = FFMAX(
> + c ? c->max_url_size : 0,
> + aligned(strlen(media_val) + (rep_id_val ? strlen(rep_id_val) : 0) +
> + (rep_bandwidth_val ? strlen(rep_bandwidth_val) : 0)));
> + max_url_size = max_url_size ? max_url_size : MAX_URL_SIZE;
> seg->url = get_content_url(baseurl_nodes, 4,
> max_url_size,
> rep_id_val,
> @@ -2369,3 +2380,4 @@ const FFInputFormat ff_dash_demuxer = {
> .read_close = dash_close,
> .read_seek = dash_read_seek,
> };
> +
Stray change
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