| Date | Wed, 11 Aug 2010 16:54:47 -0700 | From | Greg KH <> | Subject | [066/111] Btrfs: deal with NULL acl sent to btrfs_set_acl |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Chris Mason <chris.mason@oracle.com>
commit a9cc71a60c29a09174bee2fcef8f924c529fd4b7 upstream.
It is legal for btrfs_set_acl to be sent a NULL acl. This makes sure we don't dereference it. A similar patch was sent by Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com> Acked-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- fs/btrfs/acl.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
--- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -112,12 +112,14 @@ static int btrfs_set_acl(struct btrfs_tr switch (type) { case ACL_TYPE_ACCESS: mode = inode->i_mode; - ret = posix_acl_equiv_mode(acl, &mode); - if (ret < 0) - return ret; - ret = 0; - inode->i_mode = mode; name = POSIX_ACL_XATTR_ACCESS; + if (acl) { + ret = posix_acl_equiv_mode(acl, &mode); + if (ret < 0) + return ret; + inode->i_mode = mode; + } + ret = 0; break; case ACL_TYPE_DEFAULT: if (!S_ISDIR(inode->i_mode))
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