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31 lines
944 B
31 lines
944 B
1 month ago
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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: [PATCH] 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 9fafc425..86bcfdd1 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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2.38.1
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