ext4: Check that external xattr value block is zero
Currently we don't support xattrs with values stored out of line. Check
for that in ext4_xattr_check_names() to make sure we never work with
such xattrs since not all the code counts with that resulting is possible
weird corruption issues.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 22d2ebc..f845cb7 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -199,6 +199,8 @@
}
while (!IS_LAST_ENTRY(entry)) {
+ if (entry->e_value_block != 0)
+ return -EFSCORRUPTED;
if (entry->e_value_size != 0 &&
(value_start + le16_to_cpu(entry->e_value_offs) <
(void *)e + sizeof(__u32) ||