[PATCH 17/22] ubi: workaround zero division on malformed input in ubi_assert

[Ahmad Fatoum]

A zero hdrs_min_io_size is a bug and will trigger a ubi_assert.
These are critical events, but don't panic the system.

The last ubi_assert will trigger a division by zero. Add a zero check
into it, so it doesn't overlap with the first assert.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 drivers/mtd/ubi/build.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 94b4231aadc4..8bb1f0cbb901 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -320,7 +320,8 @@ static int io_init(struct ubi_device *ubi, int max_beb_per1024)
 
 	ubi_assert(ubi->hdrs_min_io_size > 0);
 	ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
-	ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
+	ubi_assert(ubi->hdrs_min_io_size &&
+		   ubi->min_io_size % ubi->hdrs_min_io_size == 0);
 
 	ubi->max_write_size = ubi->mtd->writebufsize;
 	/*
-- 
2.39.5