From f7d01aae6ec6115184de821b93fa47810abd88f9 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Mon, 26 Aug 2024 23:51:11 -0700
Subject: [PATCH] Avoid out-of-bounds pointer arithmetic in inflateCopy().

Though it does not matter for code correctness, clang's UBSan
injects code that complains about computing a pointer from an array
where the result is out-of-bounds for that array, even though the
pointer is never dereferenced. Go figure. This commit avoids that
possibility when computing distcode in inflateCopy().
---
 inflate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/inflate.c b/inflate.c
index e2fa6bb..4feac09 100644
--- a/inflate.c
+++ b/inflate.c
@@ -923,7 +923,7 @@ int ZEXPORT inflate(z_streamp strm, int flush) {
             while (state->have < 19)
                 state->lens[order[state->have++]] = 0;
             state->next = state->codes;
-            state->lencode = (const code FAR *)(state->next);
+            state->lencode = state->distcode = (const code FAR *)(state->next);
             state->lenbits = 7;
             ret = inflate_table(CODES, state->lens, 19, &(state->next),
                                 &(state->lenbits), state->work);