From 4e8b6f726dab50865d7daded2299d0187184901f Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sat, 27 Nov 2021 15:49:46 +0100
Subject: lib: Fix undefined behaviour in sha3

Arithmetic with NULL pointers is undefined behaviour. Caught by clang
13.  Fixed by using uintptr_t, which is guaranteed to be the size of a
pointer.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
---
 src/lib/sha3.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/lib/sha3.c b/src/lib/sha3.c
index 74f971ab..76ddbae6 100644
--- a/src/lib/sha3.c
+++ b/src/lib/sha3.c
@@ -52,8 +52,7 @@
 #include <assert.h>
 #include <string.h>
 
-#define IS_ALIGNED_64(p) (0 == (7 & ((const uint8_t *) (p)      \
-                                     - (const uint8_t *) 0)))
+#define IS_ALIGNED_64(p) (0 == (7 & ((uintptr_t) (p))))
 #define I64(x) x##LL
 #define ROTL64(qword, n) ((qword) << (n) ^ ((qword) >> (64 - (n))))
 
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