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avformat/libcurl: validate that the server honored a requested start offset

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Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
This commit is contained in:
Kacper Michajłow
2026-07-26 13:47:27 +02:00
parent cbed990021
commit 723a855e52
1 changed files with 5 additions and 1 deletions
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6
libavformat/libcurl.c
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@@ -300,7 +300,11 @@ static size_t header_callback(char *ptr, size_t size, size_t nitems, void *userd
pthread_mutex_lock(&c->mutex);
if (status >= 200 && status < 300) {
int64_t content_start = status == 206 ? c->hdr_content_start : 0;
if (c->probed && c->seekable && content_start != c->request_start) {
/* The reply must start at the offset we requested: for follow-up
* requests always, for the initial one when an explicit nonzero
* offset was requested. */
if ((c->probed ? c->seekable : c->off > 0) &&
content_start != c->request_start) {
av_log(c->h, AV_LOG_ERROR, "Server sent back unexpected reply "
"with offset %"PRId64" (expected %"PRId64")\n",
content_start, c->request_start);