From: Jes Sorensen <jsorensen@fb.com>
Date: Thu, 31 May 2018 17:17:46 +0000 (-0400)
Subject: super0: Use memmove() when adjusting sparc2.2 superblock data
X-Git-Tag: mdadm-4.1-rc2~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2dcd6492718c2921feac993aa71ed3a7c2522077;p=thirdparty%2Fmdadm.git

super0: Use memmove() when adjusting sparc2.2 superblock data

memcpy() does not allow overlapping copies, switch to memmove()

Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---

diff --git a/super0.c b/super0.c
index 756cab5e..42989b9f 100644
--- a/super0.c
+++ b/super0.c
@@ -520,9 +520,10 @@ static int update_super0(struct supertype *st, struct mdinfo *info,
 		 * up 4 bytes before continuing
 		 */
 		__u32 *sb32 = (__u32*)sb;
-		memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
-		       sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
-		       (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
+
+		memmove(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
+			sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
+			(MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 		if (verbose >= 0)
 			pr_err("adjusting superblock of %s for 2.2/sparc compatibility.\n",
 			       devname);