linux-kernel - [PATCH] ubifs: possible missed le64_to

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Date:   Wed, 16 Oct 2019 11:08:03 +0100
From:   "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>
To:     linux-kernel@...ts.codethink.co.uk
Cc:     "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>,
        Richard Weinberger <richard@....at>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ubifs: possible missed le64_to_cpu() in journal

In the ubifs_jnl_write_inode() functon, it calls ubifs_iget()
with xent->inum. The xent->inum is __le64, but the ubifs_iget()
takes native cpu endian.

I think that this should be changed to passing le64_to_cpu(xent->inum)
to fix the following sparse warning:

fs/ubifs/journal.c:902:58: warning: incorrect type in argument 2 (different base types)
fs/ubifs/journal.c:902:58:    expected unsigned long inum
fs/ubifs/journal.c:902:58:    got restricted __le64 [usertype] inum

Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
---
Cc: Richard Weinberger <richard@....at>
Cc: Artem Bityutskiy <dedekind1@...il.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: linux-mtd@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 fs/ubifs/journal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index d6136f7c1cfc..388fe8f5dc51 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -899,7 +899,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
 			fname_name(&nm) = xent->name;
 			fname_len(&nm) = le16_to_cpu(xent->nlen);
 
-			xino = ubifs_iget(c->vfs_sb, xent->inum);
+			xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum));
 			if (IS_ERR(xino)) {
 				err = PTR_ERR(xino);
 				ubifs_err(c, "dead directory entry '%s', error %d",
-- 
2.23.0