ext4: fix an endianness bug in ext4_encrypted_zeroout()

ex->ee_block is not host-endian (note that accesses of other fields
of *ex right next to that line go through the helpers that do proper
conversion from little-endian to host-endian; it might make sense
to add similar for ->ee_block to avoid reintroducing that kind of
bugs...)

Cc: stable@vger.kernel.org # v4.1+
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index af06830bfc00c743369737551e7bceea3b61eede..1a0835073663ff3f1dad1f376328de5e2b1332ce 100644 (file)
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -389,7 +389,7 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
        struct ext4_crypto_ctx  *ctx;
        struct page             *ciphertext_page = NULL;
        struct bio              *bio;
-       ext4_lblk_t             lblk = ex->ee_block;
+       ext4_lblk_t             lblk = le32_to_cpu(ex->ee_block);
        ext4_fsblk_t            pblk = ext4_ext_pblock(ex);
        unsigned int            len = ext4_ext_get_actual_len(ex);
        int                     ret, err = 0;