Blame patches/tar/CVE-2022-48303.patch

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From 3da78400eafcccb97e2f2fd4b227ea40d794ede8 Mon Sep 17 00:00:00 2001
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From: Sergey Poznyakoff <gray@gnu.org>
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Date: Sat, 11 Feb 2023 11:57:39 +0200
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Subject: Fix boundary checking in base-256 decoder
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* src/list.c (from_header): Base-256 encoding is at least 2 bytes
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long.
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---
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 src/list.c | 5 +++--
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 1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/list.c b/src/list.c
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index 9fafc42..86bcfdd 100644
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--- a/src/list.c
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+++ b/src/list.c
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@@ -881,8 +881,9 @@ from_header (char const *where0, size_t digs, char const *type,
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 	  where++;
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 	}
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     }
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-  else if (*where == '\200' /* positive base-256 */
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-	   || *where == '\377' /* negative base-256 */)
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+  else if (where <= lim - 2
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+	   && (*where == '\200' /* positive base-256 */
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+	       || *where == '\377' /* negative base-256 */))
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     {
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       /* Parse base-256 output.  A nonnegative number N is
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 	 represented as (256**DIGS)/2 + N; a negative number -N is
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-- 
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