From 981ee7570ad98a3cf1ae74d737e2ee619ed79171 Mon Sep 17 00:00:00 2001
From: Andrzej Hunt <andrzej@ahunt.org>
Date: Fri, 4 Jun 2021 18:25:19 +0200
Subject: Suppress MSAN detections in deflate's slide_hash().

slide_hash() knowingly reads potentially uninitialized memory, see
comment lower down about prev[n] potentially being garbage. In
this case, the result is never used.
---
 deflate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/deflate.c b/deflate.c
index c271d01..1ede12a 100644
--- a/deflate.c
+++ b/deflate.c
@@ -179,6 +179,11 @@ local const config configuration_table[10] = {
  * bit values at the expense of memory usage). We slide even when level == 0 to
  * keep the hash table consistent if we switch back to level > 0 later.
  */
+#if defined(__has_feature)
+#  if __has_feature(memory_sanitizer)
+     __attribute__((no_sanitize("memory")))
+#  endif
+#endif
 local void slide_hash(deflate_state *s) {
     unsigned n, m;
     Posf *p;
-- 
cgit v1.2.3-55-g6feb