[PATCH] udf: propagate error from udf_fiiter_add_entry

[Tristan Madani <tristmd@gmail.com>]

From: Tristan Madani <tristan@talencesecurity.com>

udf_fiiter_add_entry() triggers a WARN when it encounters an error
condition but does not propagate the error to callers. This can be
triggered by a corrupted filesystem image.

Replace the WARN with proper error propagation to allow callers to
handle the failure gracefully.

Reported-by: syzbot+969e250fc7983fc7417c@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Tristan Madani <tristan@talencesecurity.com>
---
 fs/udf/namei.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 9a3b7cef36064..2249b79c0e0b2 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -207,14 +207,9 @@ static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
 		udf_fiiter_write_fi(&iter, impuse);
 	}
 	brelse(dbh);
-	/*
-	 * We don't expect the iteration to fail as the directory has been
-	 * already verified to be correct
-	 */
-	WARN_ON_ONCE(ret);
 	udf_fiiter_release(&iter);
 
-	return 0;
+	return ret;
 }
 
 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
-- 
2.47.3