Patch attached.
From a726d0a26c9f60d65167a83789f9c222cfda5728 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <one...@gmail.com>
Date: Thu, 8 Sep 2022 09:59:09 +0200
Subject: [PATCH] avcodec/flac_parser: avoid returning too negative number
If return value is very small parser code will assert.
Signed-off-by: Paul B Mahol <one...@gmail.com>
---
libavcodec/flac_parser.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/libavcodec/flac_parser.c b/libavcodec/flac_parser.c
index 5b3a4e6e67..bd91cc1a05 100644
--- a/libavcodec/flac_parser.c
+++ b/libavcodec/flac_parser.c
@@ -663,8 +663,11 @@ static int get_best_header(FLACParseContext *fpc, const uint8_t **poutbuf,
/* Return the negative overread index so the client can compute pos.
This should be the amount overread to the beginning of the child */
- if (child)
- return child->offset - flac_fifo_size(&fpc->fifo_buf);
+ if (child) {
+ int64_t offset = child->offset - flac_fifo_size(&fpc->fifo_buf);
+ if (offset > -(1 << 28))
+ return offset;
+ }
return 0;
}
--
2.37.2
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