linux-ext4 - [PATCH] ext4: only use fscrypt_zeroout

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Message-Id: <20191226161022.53490-1-ebiggers@kernel.org>
Date:   Thu, 26 Dec 2019 10:10:22 -0600
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-ext4@...r.kernel.org
Cc:     linux-fscrypt@...r.kernel.org
Subject: [PATCH] ext4: only use fscrypt_zeroout_range() on regular files

From: Eric Biggers <ebiggers@...gle.com>

fscrypt_zeroout_range() is only for encrypted regular files, not for
encrypted directories or symlinks.

Fortunately, currently it seems it's never called on non-regular files.
But to be safe ext4 should explicitly check S_ISREG() before calling it.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/ext4/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index b8f8afd2e8b2..6586b29e9f2f 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -402,7 +402,7 @@ int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, ext4_fsblk_t pblk,
 {
 	int ret;
 
-	if (IS_ENCRYPTED(inode))
+	if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode))
 		return fscrypt_zeroout_range(inode, lblk, pblk, len);
 
 	ret = sb_issue_zeroout(inode->i_sb, pblk, len, GFP_NOFS);
-- 
2.24.1