From: Pádraig Brady <P@draigBrady.com>
Date: Thu, 23 Sep 2021 21:45:53 +0000 (+0100)
Subject: cksum: fix -a crc on 64 bit big endian systems
X-Git-Tag: v9.0~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56bff500c5e48ab9c6fc62b9d457b1f283288417;p=thirdparty%2Fcoreutils.git

cksum: fix -a crc on 64 bit big endian systems

* src/cksum.c (crc_sum_stream): On sparc64 for example,
a crc of 0 was printed due to mismatch in size of
variable copied between generator and output functions.
uint_fast32_t is generally 64 bits on 64 bit systems,
so we copy through an int to ensure we don't use the wrong
end of a 64 bit variable.
Reported by Nelson H. F. Beebe
---

diff --git a/src/cksum.c b/src/cksum.c
index 116d23f800..51afe89f68 100644
--- a/src/cksum.c
+++ b/src/cksum.c
@@ -275,7 +275,8 @@ crc_sum_stream (FILE *stream, void *resstream, uintmax_t *length)
     crc = (crc << 8) ^ crctab[0][((crc >> 24) ^ total_bytes) & 0xFF];
   crc = ~crc & 0xFFFFFFFF;
 
-  memcpy (resstream, &crc, sizeof crc);
+  unsigned int crc_out = crc;
+  memcpy (resstream, &crc_out, sizeof crc_out);
 
   return 0;
 }