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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@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Tahsin Erdogan 2017-06-21 22:14:30 -04:00 committed by Theodore Ts'o
parent f6109100ba
commit 7cec191894
1 changed files with 2 additions and 1 deletions
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3
fs/ext4/xattr.c
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@ -2167,7 +2167,8 @@ 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;