From: Eric Sandeen <sandeen@sandeen.net>
Date: Wed, 14 Jun 2017 20:47:14 +0000 (-0500)
Subject: xfs: fix unaligned access in xfs_btree_visit_blocks
X-Git-Tag: v4.12.0-rc1~28
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9a6d642cdb1c36cf1e0e63a17d2d99485afe262;p=thirdparty%2Fxfsprogs-dev.git

xfs: fix unaligned access in xfs_btree_visit_blocks

Source kernel commit: a4d768e702de224cc85e0c8eac9311763403b368

This structure copy was throwing unaligned access warnings on sparc64:

Kernel unaligned access at TPC[1043c088] xfs_btree_visit_blocks+0x88/0xe0 [xfs]

xfs_btree_copy_ptrs does a memcpy, which avoids it.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---

diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c
index a9e1fa805..33bf0dbe8 100644
--- a/libxfs/xfs_btree.c
+++ b/libxfs/xfs_btree.c
@@ -4395,7 +4395,7 @@ xfs_btree_visit_blocks(
 			xfs_btree_readahead_ptr(cur, ptr, 1);
 
 			/* save for the next iteration of the loop */
-			lptr = *ptr;
+			xfs_btree_copy_ptrs(cur, &lptr, ptr, 1);
 		}
 
 		/* for each buffer in the level */