| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 17 Jun 2009 12:31:10 +0530
From: Nikanth Karthikesan <knikanth@...e.de>
To: Jens Axboe <axboe@...nel.dk>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] Fix error handling in add_disk
Fix error handling in add_disk. Also add WARN_ON()'s in case
of error, which can be removed once the callers handle the error.
Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>
---
diff --git a/block/genhd.c b/block/genhd.c
index fe7ccc0..555cbbe 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -472,11 +472,11 @@ static char *bdevt_str(dev_t devt, char *buf)
* range must be nonzero
* The hash chain is sorted on range, so that subranges can override.
*/
-void blk_register_region(dev_t devt, unsigned long range, struct module *module,
+int blk_register_region(dev_t devt, unsigned long range, struct module *module,
struct kobject *(*probe)(dev_t, int *, void *),
int (*lock)(dev_t, void *), void *data)
{
- kobj_map(bdev_map, devt, range, module, probe, lock, data);
+ return kobj_map(bdev_map, devt, range, module, probe, lock, data);
}
EXPORT_SYMBOL(blk_register_region);
@@ -511,9 +511,9 @@ static int exact_lock(dev_t devt, void *data)
* This function registers the partitioning information in @disk
* with the kernel.
*
- * FIXME: error handling
+ * TODO: Remove WARN_ON()'s when all the callers handle the error.
*/
-void add_disk(struct gendisk *disk)
+int add_disk(struct gendisk *disk)
{
struct backing_dev_info *bdi;
dev_t devt;
@@ -531,7 +531,7 @@ void add_disk(struct gendisk *disk)
retval = blk_alloc_devt(&disk->part0, &devt);
if (retval) {
WARN_ON(1);
- return;
+ goto err_out;
}
disk_to_dev(disk)->devt = devt;
@@ -541,16 +541,40 @@ void add_disk(struct gendisk *disk)
disk->major = MAJOR(devt);
disk->first_minor = MINOR(devt);
- blk_register_region(disk_devt(disk), disk->minors, NULL,
+ retval = blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
+ if (retval) {
+ WARN_ON(1);
+ goto err_free_devt;
+ }
+
register_disk(disk);
- blk_register_queue(disk);
+
+ retval = blk_register_queue(disk);
+ if (retval) {
+ WARN_ON(1);
+ goto err_free_region;
+ }
bdi = &disk->queue->backing_dev_info;
bdi_register_dev(bdi, disk_devt(disk));
retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
"bdi");
- WARN_ON(retval);
+ if (retval) {
+ WARN_ON(1);
+ goto err_free_queue;
+ }
+
+ return 0;
+
+err_free_queue:
+ blk_unregister_queue(disk);
+err_free_region:
+ blk_unregister_region(disk_devt(disk), disk->minors);
+err_free_devt:
+ blk_free_devt(disk_devt(disk));
+err_out:
+ return retval;
}
EXPORT_SYMBOL(add_disk);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 149fda2..df3344a 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -339,7 +339,7 @@ static inline void part_dec_in_flight(struct hd_struct *part)
extern void part_round_stats(int cpu, struct hd_struct *part);
/* block/genhd.c */
-extern void add_disk(struct gendisk *disk);
+extern int add_disk(struct gendisk *disk);
extern void del_gendisk(struct gendisk *gp);
extern void unlink_gendisk(struct gendisk *gp);
extern struct gendisk *get_gendisk(dev_t dev, int *partno);
@@ -534,7 +534,7 @@ extern struct gendisk *alloc_disk_node(int minors, int node_id);
extern struct gendisk *alloc_disk(int minors);
extern struct kobject *get_disk(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);
-extern void blk_register_region(dev_t devt, unsigned long range,
+extern int blk_register_region(dev_t devt, unsigned long range,
struct module *module,
struct kobject *(*probe)(dev_t, int *, void *),
int (*lock)(dev_t, void *),
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists