ext4: fix an endianness bug in ext4_encrypted_zeroout()

commit e2c9e0b28e146c9a3bce21408f3c02e24ac7ac31 upstream.

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...)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index 2fab243a4c9e927553d1dcdcca4d4870db81891e..7d6cda4738a4fb7b10db5660b07d7ddb661d7306 100644 (file)
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -408,7 +408,7 @@ 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;