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