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dax: remove the last BUG_ON() from fs/dax.c 

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.zwisler@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Ross Zwisler 2016-11-08 11:32:00 +11:00 committed by Dave Chinner
parent ce95ab0fa6
commit aada54f980
1 changed files with 2 additions and 1 deletions
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3
fs/dax.c
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@ -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;