Commit ae9ebe7c authored Oct 24, 2016 by Eryu Guan Committed by Steve French Nov 28, 2016

CIFS: iterate over posix acl xattr entry correctly in ACL_to_cifs_posix()



Commit 2211d5ba ("posix_acl: xattr representation cleanups")
removes the typedefs and the zero-length a_entries array in struct
posix_acl_xattr_header, and uses bare struct posix_acl_xattr_header
and struct posix_acl_xattr_entry directly.

But it failed to iterate over posix acl slots when converting posix
acls to CIFS format, which results in several test failures in
xfstests (generic/053 generic/105) when testing against a samba v1
server, starting from v4.9-rc1 kernel. e.g.

  [root@localhost xfstests]# diff -u tests/generic/105.out /root/xfstests/results//generic/105.out.bad
  --- tests/generic/105.out       2016-09-19 16:33:28.577962575 +0800
  +++ /root/xfstests/results//generic/105.out.bad 2016-10-22 15:41:15.201931110 +0800
  @@ -1,3 +1,4 @@
   QA output created by 105
   -rw-r--r-- root
  +setfacl: subdir: Invalid argument
   -rw-r--r-- root

Fix it by introducing a new "ace" var, like what
cifs_copy_posix_acl() does, and iterating posix acl xattr entries
over it in the for loop.

Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>

parent b8c60012

fs/cifs/cifssmb.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -3427,6 +3427,7 @@ static __u16 ACL_to_cifs_posix(char parm_data, const char pACL,
		__u16 rc = 0;
		struct cifs_posix_acl cifs_acl = (struct cifs_posix_acl )parm_data;
		struct posix_acl_xattr_header local_acl = (void )pACL;
		struct posix_acl_xattr_entry ace = (void )(local_acl + 1);
		int count;
		int i;

		@@ -3453,8 +3454,7 @@ static __u16 ACL_to_cifs_posix(char parm_data, const char pACL,
		return 0;
		}
		for (i = 0; i < count; i++) {
		rc = convert_ace_to_cifs_ace(&cifs_acl->ace_array[i],
		(struct posix_acl_xattr_entry *)(local_acl + 1));
		rc = convert_ace_to_cifs_ace(&cifs_acl->ace_array[i], &ace[i]);
		if (rc != 0) {
		/* ACE not converted */
		break;