[FFmpeg-devel] [PATCH] avcodec/flac_parser: fix triggered assert

[Paul B Mahol <onemda@gmail.com>]

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Patch attached.

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From a726d0a26c9f60d65167a83789f9c222cfda5728 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@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 <onemda@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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