https://github.com/dovecot/core/pull/230

From 33cda8cbbc445d27ce38234b17442a9abe66167f Mon Sep 17 00:00:00 2001
From: Martin Liska <mliska@suse.cz>
Date: Fri, 24 Mar 2023 13:33:13 +0100
Subject: [PATCH 1/2] lib: md4 - Fix violation of strict aliasing.

Fix miscompilation when LTO is enabled.

(cherry picked from commit f0c1cf42ea78d22e2674b03fe65f0ee6545c5b99)
--- a/src/lib/md4.c
+++ b/src/lib/md4.c
@@ -34,23 +34,6 @@
 	(a) = ((a) << (s)) | ((a) >> (32 - (s)))
 
 
-/*
- * SET reads 4 input bytes in little-endian byte order and stores them
- * in a properly aligned word in host byte order.
- *
- * The check for little-endian architectures which tolerate unaligned
- * memory accesses is just an optimization.  Nothing will break if it
- * doesn't work.
- */
-#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
-/* uint_fast32_t might be 64 bit, and thus may read 4 more bytes
- * beyond the end of the buffer. So only read precisely 32 bits
- */
-#define SET(n)				\
-	(*(const uint32_t *)&ptr[(n) * 4])
-#define GET(n) \
-	SET(n)
-#else
 #define SET(n) \
 	(ctx->block[(n)] = \
 	(uint_fast32_t)ptr[(n) * 4] | \
@@ -59,7 +42,6 @@
 	((uint_fast32_t)ptr[(n) * 4 + 3] << 24))
 #define GET(n) \
 	(ctx->block[(n)])
-#endif
 
 /*
  * This processes one or more 64-byte data blocks, but does NOT update

From 6cdd0b1428ab393ec5996ed10a98e7a7043c501f Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Mon, 27 Mar 2023 02:25:12 +0100
Subject: [PATCH 2/2] lib: md5: Fix strict aliasing violation

Followup to f0c1cf42ea78d22e2674b03fe65f0ee6545c5b99. It's exactly the
same code as in md4, so let's rip it out here too.

(cherry picked from commit 6de2e4ac0b9abd4ab09b68f1f7e5f032705080b1)
--- a/src/lib/md5.c
+++ b/src/lib/md5.c
@@ -38,20 +38,6 @@
 	(a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
 	(a) += (b);
 
-/*
- * SET reads 4 input bytes in little-endian byte order and stores them
- * in a properly aligned word in host byte order.
- *
- * The check for little-endian architectures which tolerate unaligned
- * memory accesses is just an optimization.  Nothing will break if it
- * doesn't work.
- */
-#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
-#define SET(n) \
-	(*(const uint32_t *)&ptr[(n) * 4])
-#define GET(n) \
-	SET(n)
-#else
 #define SET(n) \
 	(ctx->block[(n)] = \
 	(uint_fast32_t)ptr[(n) * 4] | \
@@ -60,7 +46,6 @@
 	((uint_fast32_t)ptr[(n) * 4 + 3] << 24))
 #define GET(n) \
 	(ctx->block[(n)])
-#endif
 
 /*
  * This processes one or more 64-byte data blocks, but does NOT update