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authorChristoph Hellwig <hch@lst.de>2017-08-23 19:10:29 +0200
committerJens Axboe <axboe@kernel.dk>2017-08-23 12:49:50 -0600
commitde65b0123216a8e1dbe3ca1eb20a45572b9e71d9 (patch)
treef1c0278d6d8e18f22b42829b81e058def7ce69bc /block/genhd.c
parent10433d04b8e647a50feffec72fd3cf40ce42b084 (diff)
downloadlinux-0-day-de65b0123216a8e1dbe3ca1eb20a45572b9e71d9.tar.gz
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>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 2367087..3380a1e 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)) {