Don't take down the kernel if we get an invalid 'from' and 'length'
argument pair.  Just warn once and return an error.

Signed-off-by: Ross Zwisler <ross.zwis...@linux.intel.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Jan Kara <j...@suse.cz>
---
 fs/dax.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index ac28cdf..98189ac 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1194,7 +1194,8 @@ int dax_zero_page_range(struct inode *inode, loff_t from, 
unsigned length,
        /* Block boundary? Nothing to do */
        if (!length)
                return 0;
-       BUG_ON((offset + length) > PAGE_SIZE);
+       if (WARN_ON_ONCE((offset + length) > PAGE_SIZE))
+               return -EINVAL;
 
        memset(&bh, 0, sizeof(bh));
        bh.b_bdev = inode->i_sb->s_bdev;
-- 
2.9.0

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