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staging/lustre/mdc: Handle empty but non-zero acl xattr

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We have found that posix_acl_access can have a value
of \002\000\000\000.  In that case body->aclsize is
non-zero, but the there are no actuall acls stored
in the xattr.

In mdc_unpack_acl(), it only checks IS_ERR() on the
pointer returned by posix_acl_from_xattr(), it does not
check for NULL.  Because of the above situation, the
xattr aclsize can be non-zero, but posic_acl_from_xattr()
still returns NULL.  Passing NULL to posix_acl_valid()
crashes the kernel.

We add a check to properly handle the NULL return value.

Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/11989
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5150
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christopher J. Morrone 2015-03-25 21:53:18 -04:00 • committed by Greg Kroah-Hartman
commit f428940047
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/lustre/lustre/mdc/mdc_request.c
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@ -481,6 +481,9 @@ static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md)
return -EPROTO;
acl = posix_acl_from_xattr(&init_user_ns, buf, body->aclsize);
if (acl == NULL)
return 0;
if (IS_ERR(acl)) {
rc = PTR_ERR(acl);
CERROR("convert xattr to acl: %d\n", rc);