linux-kernel - [PATCH] [64/223] hostfs: fix UML crash: remove f

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Message-Id: <20101212234602.5DAB5B27BF@basil.firstfloor.org>
Date:	Mon, 13 Dec 2010 00:46:02 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	richard@....at, toralf.foerster@....de, hch@....de,
	viro@...iv.linux.org.uk, jdike@...toit.com,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	gregkh@...e.de, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: [PATCH] [64/223] hostfs: fix UML crash: remove f_spare from hostfs

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Richard Weinberger <richard@....at>

commit 1b627d5771312c92404b66f0a0b16f66036dd2e1 upstream.

365b1818 ("add f_flags to struct statfs(64)") resized f_spare within
struct statfs which caused a UML crash.  There is no need to copy f_spare.

Signed-off-by: Richard Weinberger <richard@....at>
Reported-by: Toralf Förster <toralf.foerster@....de>
Tested-by: Toralf Förster <toralf.foerster@....de>
Cc: Christoph Hellwig <hch@....de>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Jeff Dike <jdike@...toit.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/hostfs/hostfs.h      |    3 +--
 fs/hostfs/hostfs_kern.c |    2 +-
 fs/hostfs/hostfs_user.c |    9 ++-------
 3 files changed, 4 insertions(+), 10 deletions(-)

Index: linux/fs/hostfs/hostfs.h
===================================================================
--- linux.orig/fs/hostfs/hostfs.h
+++ linux/fs/hostfs/hostfs.h
@@ -86,7 +86,6 @@ extern int rename_file(char *from, char
 extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
 		     long long *bfree_out, long long *bavail_out,
 		     long long *files_out, long long *ffree_out,
-		     void *fsid_out, int fsid_size, long *namelen_out,
-		     long *spare_out);
+		     void *fsid_out, int fsid_size, long *namelen_out);
 
 #endif
Index: linux/fs/hostfs/hostfs_kern.c
===================================================================
--- linux.orig/fs/hostfs/hostfs_kern.c
+++ linux/fs/hostfs/hostfs_kern.c
@@ -272,7 +272,7 @@ int hostfs_statfs(struct dentry *dentry,
 	err = do_statfs(HOSTFS_I(dentry->d_sb->s_root->d_inode)->host_filename,
 			&sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files,
 			&f_ffree, &sf->f_fsid, sizeof(sf->f_fsid),
-			&sf->f_namelen, sf->f_spare);
+			&sf->f_namelen);
 	if (err)
 		return err;
 	sf->f_blocks = f_blocks;
Index: linux/fs/hostfs/hostfs_user.c
===================================================================
--- linux.orig/fs/hostfs/hostfs_user.c
+++ linux/fs/hostfs/hostfs_user.c
@@ -402,8 +402,7 @@ int rename_file(char *from, char *to)
 int do_statfs(char *root, long *bsize_out, long long *blocks_out,
 	      long long *bfree_out, long long *bavail_out,
 	      long long *files_out, long long *ffree_out,
-	      void *fsid_out, int fsid_size, long *namelen_out,
-	      long *spare_out)
+	      void *fsid_out, int fsid_size, long *namelen_out)
 {
 	struct statfs64 buf;
 	int err;
@@ -422,10 +421,6 @@ int do_statfs(char *root, long *bsize_ou
 	       sizeof(buf.f_fsid) > fsid_size ? fsid_size :
 	       sizeof(buf.f_fsid));
 	*namelen_out = buf.f_namelen;
-	spare_out[0] = buf.f_spare[0];
-	spare_out[1] = buf.f_spare[1];
-	spare_out[2] = buf.f_spare[2];
-	spare_out[3] = buf.f_spare[3];
-	spare_out[4] = buf.f_spare[4];
+
 	return 0;
 }
--
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