ubi: Refuse attaching if mtd's erasesize is 0

There exists mtd devices with zero erasesize, which will trigger a
divide-by-zero exception while attaching ubi device.
Fix it by refusing attaching if mtd's erasesize is 0.

Fixes: 801c135 ("UBI: Unsorted Block Images")
Reported-by: Yu Hao <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/T/
Signed-off-by: Zhihao Cheng <[email protected]>
Reviewed-by: Miquel Raynal <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

Author: Zhihao Cheng

drivers/mtd/ubi/build.c

@@ -894,6 +894,13 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 		return -EINVAL;
 	}
 
+	/* UBI cannot work on flashes with zero erasesize. */
+	if (!mtd->erasesize) {
+		pr_err("ubi: refuse attaching mtd%d - zero erasesize flash is not supported\n",
+			mtd->index);
+		return -EINVAL;
+	}
+
 	if (ubi_num == UBI_DEV_NUM_AUTO) {
 		/* Search for an empty slot in the @ubi_devices array */
 		for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)