linux-kernel - [PATCH] ext4 crypto: fix to check feature status before get policy

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Message-Id: <20190804095643.7393-1-chao@kernel.org>
Date:   Sun,  4 Aug 2019 17:56:43 +0800
From:   Chao Yu <chao@...nel.org>
To:     tytso@....edu, adilger.kernel@...ger.ca
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        ebiggers@...nel.org, linux-fscrypt@...r.kernel.org,
        chao@...nel.org, Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] ext4 crypto: fix to check feature status before get policy

From: Chao Yu <yuchao0@...wei.com>

When getting fscrypto policy via EXT4_IOC_GET_ENCRYPTION_POLICY, if
encryption feature is off, it's better to return EOPNOTSUPP instead
of ENODATA, so let's add ext4_has_feature_encrypt() to do the check
for that.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/ext4/ioctl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 442f7ef873fc..bf87835c1237 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -1112,9 +1112,11 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return -EOPNOTSUPP;
 #endif
 	}
-	case EXT4_IOC_GET_ENCRYPTION_POLICY:
+	case EXT4_IOC_GET_ENCRYPTION_POLICY: {
+		if (!ext4_has_feature_encrypt(sb))
+			return -EOPNOTSUPP;
 		return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
-
+	}
 	case EXT4_IOC_FSGETXATTR:
 	{
 		struct fsxattr fa;
-- 
2.22.0