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 e52e754..219fa2b 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;
--
2.7.4
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