summaryrefslogtreecommitdiff
path: root/block/genhd.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 713b7d4fe7a1..dd305c65ffb0 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -279,6 +279,7 @@ EXPORT_SYMBOL_GPL(disk_map_sector_rcu);
* Can be deleted altogether. Later.
*
*/
+#define BLKDEV_MAJOR_HASH_SIZE 255
static struct blk_major_name {
struct blk_major_name *next;
int major;
@@ -296,12 +297,11 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
{
struct blk_major_name *dp;
- if (offset < BLKDEV_MAJOR_HASH_SIZE) {
- mutex_lock(&block_class_lock);
- for (dp = major_names[offset]; dp; dp = dp->next)
+ mutex_lock(&block_class_lock);
+ for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next)
+ if (dp->major == offset)
seq_printf(seqf, "%3d %s\n", dp->major, dp->name);
- mutex_unlock(&block_class_lock);
- }
+ mutex_unlock(&block_class_lock);
}
#endif /* CONFIG_PROC_FS */
@@ -346,6 +346,14 @@ int register_blkdev(unsigned int major, const char *name)
ret = major;
}
+ if (major >= BLKDEV_MAJOR_MAX) {
+ pr_err("register_blkdev: major requested (%d) is greater than the maximum (%d) for %s\n",
+ major, BLKDEV_MAJOR_MAX, name);
+
+ ret = -EINVAL;
+ goto out;
+ }
+
p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL);
if (p == NULL) {
ret = -ENOMEM;