From: Christoph Hellwig <hch@lst.de>
Date: Wed, 23 Aug 2017 17:10:29 +0000 (+0200)
Subject: block: reject attempts to allocate more than DISK_MAX_PARTS partitions
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=de65b0123216a8e1dbe3ca1eb20a45572b9e71d9;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

block: reject attempts to allocate more than DISK_MAX_PARTS partitions

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/genhd.c b/block/genhd.c
index 2367087cdb7c..3380a1e73ea0 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1357,6 +1357,13 @@ struct gendisk *alloc_disk_node(int minors, int node_id)
 	struct gendisk *disk;
 	struct disk_part_tbl *ptbl;
 
+	if (minors > DISK_MAX_PARTS) {
+		printk(KERN_ERR
+			"block: can't allocated more than %d partitions\n",
+			DISK_MAX_PARTS);
+		minors = DISK_MAX_PARTS;
+	}
+
 	disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
 	if (disk) {
 		if (!init_part_stats(&disk->part0)) {