linux-ext4 - [PATCH 08/14] fscrypt: drop empty name check from fname

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Date:   Fri, 23 Mar 2018 12:23:52 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     linux-fscrypt@...r.kernel.org, "Theodore Y . Ts'o" <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, Jaegeuk Kim <jaegeuk@...nel.org>,
        Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH 08/14] fscrypt: drop empty name check from fname_decrypt()

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

fname_decrypt() is validating that the encrypted filename is nonempty.
However, earlier a stronger precondition was already enforced: the
encrypted filename must be at least 16 (FS_CRYPTO_BLOCK_SIZE) bytes.

Drop the redundant check for an empty filename.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/crypto/fname.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
index cc9590b5f371..c4eb3a235ae4 100644
--- a/fs/crypto/fname.c
+++ b/fs/crypto/fname.c
@@ -97,9 +97,6 @@ static int fname_decrypt(struct inode *inode,
 	int res = 0;
 	char iv[FS_CRYPTO_BLOCK_SIZE];
 
-	if (iname->len <= 0)
-		return -EIO;
-
 	/* Allocate request */
 	req = skcipher_request_alloc(tfm, GFP_NOFS);
 	if (!req)
-- 
2.17.0.rc0.231.g781580f067-goog