linux-ext4 - [PATCH 16/32] ext4: fix ext4_xattr

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Message-Id: <20170621212142.16581-16-tahsin@google.com>
Date:   Wed, 21 Jun 2017 14:21:26 -0700
From:   Tahsin Erdogan <tahsin@...gle.com>
To:     Andreas Dilger <adilger@...ger.ca>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
        linux-ext4@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Tahsin Erdogan <tahsin@...gle.com>
Subject: [PATCH 16/32] ext4: fix ext4_xattr_cmp()

When a xattr entry refers to an external inode, the value data is not
available in the inline area so we should not attempt to read it using
value offset.

Signed-off-by: Tahsin Erdogan <tahsin@...gle.com>
---
 fs/ext4/xattr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 9c243b3510b7..739f73a5a345 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2169,7 +2169,8 @@ ext4_xattr_cmp(struct ext4_xattr_header *header1,
 		    entry1->e_value_inum != entry2->e_value_inum ||
 		    memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len))
 			return 1;
-		if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs),
+		if (!entry1->e_value_inum &&
+		    memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs),
 			   (char *)header2 + le16_to_cpu(entry2->e_value_offs),
 			   le32_to_cpu(entry1->e_value_size)))
 			return 1;
-- 
2.13.1.611.g7e3b11ae1-goog