linux-kernel - [PATCH 4.14 194/246] staging: lustre: llite: correct removexattr detection

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Date:   Wed,  1 Aug 2018 18:51:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "John L. Hammond" <john.hammond@...el.com>,
        Dmitry Eremin <dmitry.eremin@...el.com>,
        James Simmons <uja.ornl@...oo.com>,
        James Simmons <jsimmons@...radead.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 194/246] staging: lustre: llite: correct removexattr detection

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Simmons <jsimmons@...radead.org>

[ Upstream commit 1b60f6dfa38403ff7c4d0b4b7ecdb810f9789a2a ]

In ll_xattr_set_common() detect the removexattr() case correctly by
testing for a NULL value as well as XATTR_REPLACE.

Signed-off-by: John L. Hammond <john.hammond@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10787
Reviewed-on: https://review.whamcloud.com/
Reviewed-by: Dmitry Eremin <dmitry.eremin@...el.com>
Reviewed-by: James Simmons <uja.ornl@...oo.com>
Signed-off-by: James Simmons <jsimmons@...radead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/lustre/lustre/llite/xattr.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/staging/lustre/lustre/llite/xattr.c
+++ b/drivers/staging/lustre/lustre/llite/xattr.c
@@ -93,7 +93,11 @@ ll_xattr_set_common(const struct xattr_h
 	__u64 valid;
 	int rc;
 
-	if (flags == XATTR_REPLACE) {
+	/* When setxattr() is called with a size of 0 the value is
+	 * unconditionally replaced by "". When removexattr() is
+	 * called we get a NULL value and XATTR_REPLACE for flags.
+	 */
+	if (!value && flags == XATTR_REPLACE) {
 		ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
 		valid = OBD_MD_FLXATTRRM;
 	} else {