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authorDavid Gstir <david@sigma-star.at>2016-12-07 01:53:54 +0300
committerTheodore Ts'o <tytso@mit.edu>2016-12-12 00:26:11 +0300
commit9e532772b4e36888584efc7a9531143bd43355b3 (patch)
treee4e9e4f064c79751cfcd8cb820e985474ff81109 /fs/crypto
parente550c16c8aab95c7996b0c864d5fcedc2c430a43 (diff)
downloadlinux-9e532772b4e36888584efc7a9531143bd43355b3.tar.xz
fscrypt: Never allocate fscrypt_ctx on in-place encryption
In case of in-place encryption fscrypt_ctx was allocated but never released. Since we don't need it for in-place encryption, we skip allocating it. Fixes: 1c7dcf69eea3 ("fscrypt: Add in-place encryption mode") Signed-off-by: David Gstir <david@sigma-star.at> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/crypto.c30
1 files changed, 19 insertions, 11 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index d19a42f3a983..f287f76cc906 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -246,16 +246,26 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
BUG_ON(plaintext_len % FS_CRYPTO_BLOCK_SIZE != 0);
+ if (inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION) {
+ /* with inplace-encryption we just encrypt the page */
+ err = do_page_crypto(inode, FS_ENCRYPT, index,
+ plaintext_page, ciphertext_page,
+ plaintext_len, plaintext_offset,
+ gfp_flags);
+ if (err)
+ return ERR_PTR(err);
+
+ return ciphertext_page;
+ }
+
ctx = fscrypt_get_ctx(inode, gfp_flags);
if (IS_ERR(ctx))
return (struct page *)ctx;
- if (!(inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION)) {
- /* The encryption operation will require a bounce page. */
- ciphertext_page = alloc_bounce_page(ctx, gfp_flags);
- if (IS_ERR(ciphertext_page))
- goto errout;
- }
+ /* The encryption operation will require a bounce page. */
+ ciphertext_page = alloc_bounce_page(ctx, gfp_flags);
+ if (IS_ERR(ciphertext_page))
+ goto errout;
ctx->w.control_page = plaintext_page;
err = do_page_crypto(inode, FS_ENCRYPT, index,
@@ -266,11 +276,9 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
ciphertext_page = ERR_PTR(err);
goto errout;
}
- if (!(inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION)) {
- SetPagePrivate(ciphertext_page);
- set_page_private(ciphertext_page, (unsigned long)ctx);
- lock_page(ciphertext_page);
- }
+ SetPagePrivate(ciphertext_page);
+ set_page_private(ciphertext_page, (unsigned long)ctx);
+ lock_page(ciphertext_page);
return ciphertext_page;
errout: