From b683c0dbe278f71e371376847deebd44fdcf392f Mon Sep 17 00:00:00 2001
From: Robert Rose <robert.rose@mailbox.org>
Date: Sun, 24 Nov 2024 23:36:53 +0100
Subject: [PATCH] prevent possible segfault when creating seek table

Add a check whether the seek table of a `ZSTD_seekable` is initialized
before creating a new seek table from it. Return `NULL`, if the check
fails.
---
 contrib/seekable_format/zstdseek_decompress.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/contrib/seekable_format/zstdseek_decompress.c b/contrib/seekable_format/zstdseek_decompress.c
index 4fefc5f2eb6..5ee6e0541a5 100644
--- a/contrib/seekable_format/zstdseek_decompress.c
+++ b/contrib/seekable_format/zstdseek_decompress.c
@@ -252,6 +252,8 @@ size_t ZSTD_seekable_free(ZSTD_seekable* zs)
 
 ZSTD_seekTable* ZSTD_seekTable_create_fromSeekable(const ZSTD_seekable* zs)
 {
+    assert(zs != NULL);
+    if (zs->seekTable.entries == NULL) return NULL;
     ZSTD_seekTable* const st = (ZSTD_seekTable*)malloc(sizeof(ZSTD_seekTable));
     if (st==NULL) return NULL;