[PATCH 5.10 159/243] ubifs: Fix off-by-one error

Greg Kroah-Hartman
2021-07-19T17:38:31Z

From: Sascha Hauer <s.hauer@pengutronix.de>

[ Upstream commit d984bcf5766dbdbe95d325bb8a1b49a996fecfd4 ]

An inode is allowed to have ubifs_xattr_max_cnt() xattrs, so we must
complain only when an inode has more xattrs, having exactly
ubifs_xattr_max_cnt() xattrs is fine.
With this the maximum number of xattrs can be created without hitting
the "has too many xattrs" warning when removing it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ubifs/journal.c | 2 +-
fs/ubifs/xattr.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 091c2ad8f211..7927dea2baba 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -881,7 +881,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
struct inode *xino;
struct ubifs_dent_node *xent, *pxent = NULL;

- if (ui->xattr_cnt >= ubifs_xattr_max_cnt(c)) {
+ if (ui->xattr_cnt > ubifs_xattr_max_cnt(c)) {
ubifs_err(c, "Cannot delete inode, it has too much xattrs!");
goto out_release;
}
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index 09280796fc61..17745f5462f0 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -512,7 +512,7 @@ int ubifs_purge_xattrs(struct inode *host)
struct fscrypt_name nm = {0};
int err;

- if (ubifs_inode(host)->xattr_cnt < ubifs_xattr_max_cnt(c))
+ if (ubifs_inode(host)->xattr_cnt <= ubifs_xattr_max_cnt(c))
return 0;

ubifs_warn(c, "inode %lu has too many xattrs, doing a non-atomic deletion",
--
2.30.2