[PATCH 11/12] xfs: refactor name/length checks in xfs_attri_validate

Darrick J. Wong
2024-04-10T00:53:15Z

From: Darrick J. Wong <djwong@kernel.org>

Move the name and length checks into the attr op switch statement so
that we can perform more specific checks of the value length. Over the
next few patches we're going to add new attr op flags with different
validation requirements.

While we're at it, remove the incorrect comment.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/xfs_attr_item.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
index 59723e5f483e2..5ad14be760adc 100644
--- a/fs/xfs/xfs_attr_item.c
+++ b/fs/xfs/xfs_attr_item.c
@@ -486,23 +486,26 @@ xfs_attri_validate(
if (attrp->alfi_attr_filter & ~XFS_ATTRI_FILTER_MASK)
return false;

- /* alfi_op_flags should be either a set or remove */
switch (op) {
case XFS_ATTRI_OP_FLAGS_SET:
case XFS_ATTRI_OP_FLAGS_REPLACE:
+ if (attrp->alfi_value_len > XATTR_SIZE_MAX)
+ return false;
+ if (attrp->alfi_name_len == 0 ||
+ attrp->alfi_name_len > XATTR_NAME_MAX)
+ return false;
+ break;
case XFS_ATTRI_OP_FLAGS_REMOVE:
+ if (attrp->alfi_value_len != 0)
+ return false;
+ if (attrp->alfi_name_len == 0 ||
+ attrp->alfi_name_len > XATTR_NAME_MAX)
+ return false;
break;
default:
return false;
}

- if (attrp->alfi_value_len > XATTR_SIZE_MAX)
- return false;
-
- if ((attrp->alfi_name_len > XATTR_NAME_MAX) ||
- (attrp->alfi_name_len == 0))
- return false;
-
return xfs_verify_ino(mp, attrp->alfi_ino);
}