Re: [PATCH v2 11/11] block: sed-opal: check size of shadow mbr

On Mon, Mar 19, 2018 at 09:01:51PM +0100, Christoph Hellwig wrote:

On Mon, Mar 19, 2018 at 07:36:53PM +0100, Jonas Rabenstein wrote:

quoted

Check whether the shadow mbr does fit in the provided space on the
target. Also a proper firmware should handle this case and return an
error we may prevent problems or even damage with crappy firmwares.

Signed-off-by: Jonas Rabenstein <redacted>

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 51f8034edbf7..9c73bd24c55f 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c

@@ -1545,6 +1545,20 @@ static int write_shadow_mbr(struct opal_dev *dev, void *data)
 	u64 len;
 	int err = 0;
 
+	/* do we fit in the available shadow mbr space? */
+	err = generic_get_table_info(dev, OPAL_MBR, OPAL_TABLE_ROWS);

And here it gets used.  So this should be merged with the previous patch.

Thought, as the previous one provides a generic interface which is only
used here for this specific use case, separate patches would be better.
But I will merge them in a v3 with all the other comments on the other
patches.