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authorJeff Mahoney <jeffm@suse.com>2010-04-23 13:17:41 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-07-05 10:11:20 -0700
commit7e13be2dc48c3e3ba6a2e62cd1b4b5d9543652c4 (patch)
tree8082134745c02b2a48eaf04f2960613cfdbb061e
parent5cf71f681e85b0491bb00fac2144d6c07b9917d4 (diff)
reiserfs: fix corruption during shrinking of xattrs
commit fb2162df74bb19552db3d988fd11c787cf5fad56 upstream. Commit 48b32a3553a54740d236b79a90f20147a25875e3 ("reiserfs: use generic xattr handlers") introduced a problem that causes corruption when extended attributes are replaced with a smaller value. The issue is that the reiserfs_setattr to shrink the xattr file was moved from before the write to after the write. The root issue has always been in the reiserfs xattr code, but was papered over by the fact that in the shrink case, the file would just be expanded again while the xattr was written. The end result is that the last 8 bytes of xattr data are lost. This patch fixes it to use new_size. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=14826 Signed-off-by: Jeff Mahoney <jeffm@suse.com> Reported-by: Christian Kujau <lists@nerdbynature.de> Tested-by: Christian Kujau <lists@nerdbynature.de> Cc: Edward Shishkin <edward.shishkin@gmail.com> Cc: Jethro Beekman <kernel@jbeekman.nl> Cc: Greg Surbey <gregsurbey@hotmail.com> Cc: Marco Gatti <marco.gatti@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/reiserfs/xattr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index bfb1e35eab08..cc1caa26be52 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -536,7 +536,7 @@ reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
if (!err && new_size < i_size_read(dentry->d_inode)) {
struct iattr newattrs = {
.ia_ctime = current_fs_time(inode->i_sb),
- .ia_size = buffer_size,
+ .ia_size = new_size,
.ia_valid = ATTR_SIZE | ATTR_CTIME,
};
mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);