fsdax: Fix infinite loop in dax_iomap_rw()

[linux-stable] / fs / dax.c

diff --git a/fs/dax.c b/fs/dax.c
index 4155a6107fa10d20914446e5798110fcddddc08f..7ab248ed21aa3eb253daefd215f7812da48baf3c 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1241,6 +1241,9 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
        loff_t done = 0;
        int ret;
 
+       if (!iomi.len)
+               return 0;
+
        if (iov_iter_rw(iter) == WRITE) {
                lockdep_assert_held_write(&iomi.inode->i_rwsem);
                iomi.flags |= IOMAP_WRITE;