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From 63814d71ed81baec6f8b55513b561e045b160fa2 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@trombone>
Date: Tue, 28 Jun 2022 22:30:08 -0500
Subject: [PATCH 1/2] gzip: detect invalid input
Conflict: Context adapt: Tracevv((stderr,"\\[%d,%d]", w-d, n));
Reference: https://git.savannah.gnu.org/cgit/gzip.git/commit/?id=4b58eee79d3af3647adb4c78938d83970e788975
Problem reported by Young Mo Kang and fix from Mark Adler (Bug#56247).
* inflate.c: Include stdbool.h.
(fresh): New static var.
* inflate.c (flush_output): Clear it.
(inflate): Set it.
(inflate_codes): Fail if the offset is outside a fresh input window.
---
inflate.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/inflate.c b/inflate.c
index f54eb65..d5b8c44 100644
--- a/inflate.c
+++ b/inflate.c
@@ -117,6 +117,7 @@
#include <config.h>
+#include <stdbool.h>
#include <stdlib.h>
#include "tailor.h"
@@ -153,8 +154,9 @@ static int huft_free (struct huft *);
"uch *slide;" and then malloc'ed in the latter case. The definition
must be in unzip.h, included above. */
/* unsigned wp; current position in slide */
+static bool fresh;
#define wp outcnt
-#define flush_output(w) (wp=(w),flush_window())
+#define flush_output(w) (fresh = false, wp = (w), flush_window ())
/* Tables for deflate from PKZIP's appnote.txt. */
static unsigned border[] = { /* Order of the bit length code lengths */
@@ -572,6 +574,8 @@ inflate_codes(struct huft *tl, struct huft *td, int bl, int bd)
NEEDBITS(e)
d = w - t->v.n - ((unsigned)b & mask_bits[e]);
DUMPBITS(e)
+ if (fresh && w <= d)
+ return 1;
Tracevv((stderr,"\\[%d,%d]", w-d, n));
/* do the copy */
@@ -954,6 +958,7 @@ inflate(void)
wp = 0;
bk = 0;
bb = 0;
+ fresh = true;
/* decompress until the last block */
--
2.27.0
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