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demux_mkv: ignore duplicated BlockAdditions to avoid memory leak

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This can happen only on invalid files.

Found by OSS-Fuzz.
This commit is contained in:
Kacper Michajłow 2024-07-10 21:27:54 +02:00
parent b13642e115
commit 9158653982
1 changed files with 1 additions and 1 deletions
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2
demux/demux_mkv.c
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@ -3065,7 +3065,7 @@ static int read_block_group(demuxer_t *demuxer, int64_t end,
if (ebml_read_element(s, &parse_ctx, &additions,
&ebml_block_additions_desc) < 0)
return -1;
if (additions.n_block_more > 0) {
if (additions.n_block_more > 0 && !block->additions) {
block->additions = talloc_dup(NULL, &additions);
talloc_steal(block->additions, parse_ctx.talloc_ctx);
parse_ctx.talloc_ctx = NULL;