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authorTejun Heo <tj@kernel.org>2011-10-19 14:31:15 +0200
committerJens Axboe <axboe@kernel.dk>2011-10-19 14:31:15 +0200
commitece84241b93c4693bfe0a8ec9a043a16d216d0cd (patch)
tree4bddd724aaecaf391488d3194d59cef80ef0c9eb /block
parent523e1d399ce0e23bec562abe2b2f8d297af81161 (diff)
downloadlinux-ece84241b93c4693bfe0a8ec9a043a16d216d0cd.tar.gz
block: fix genhd refcounting in blkio_policy_parse_and_set()
blkio_policy_parse_and_set() calls blkio_check_dev_num() to check whether the given dev_t is valid. blkio_check_dev_num() uses get_gendisk() for verification but never puts the returned genhd leaking the reference. This patch collapses blkio_check_dev_num() into its caller and updates it such that the genhd is put before returning. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c56
1 files changed, 23 insertions, 33 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index b596e54ddd7..d61ec5636ce 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -768,25 +768,14 @@ static uint64_t blkio_get_stat(struct blkio_group *blkg,
return disk_total;
}
-static int blkio_check_dev_num(dev_t dev)
-{
- int part = 0;
- struct gendisk *disk;
-
- disk = get_gendisk(dev, &part);
- if (!disk || part)
- return -ENODEV;
-
- return 0;
-}
-
static int blkio_policy_parse_and_set(char *buf,
struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid)
{
+ struct gendisk *disk = NULL;
char *s[4], *p, *major_s = NULL, *minor_s = NULL;
- int ret;
unsigned long major, minor;
- int i = 0;
+ int i = 0, ret = -EINVAL;
+ int part;
dev_t dev;
u64 temp;
@@ -804,37 +793,36 @@ static int blkio_policy_parse_and_set(char *buf,
}
if (i != 2)
- return -EINVAL;
+ goto out;
p = strsep(&s[0], ":");
if (p != NULL)
major_s = p;
else
- return -EINVAL;
+ goto out;
minor_s = s[0];
if (!minor_s)
- return -EINVAL;
+ goto out;
- ret = strict_strtoul(major_s, 10, &major);
- if (ret)
- return -EINVAL;
+ if (strict_strtoul(major_s, 10, &major))
+ goto out;
- ret = strict_strtoul(minor_s, 10, &minor);
- if (ret)
- return -EINVAL;
+ if (strict_strtoul(minor_s, 10, &minor))
+ goto out;
dev = MKDEV(major, minor);
- ret = strict_strtoull(s[1], 10, &temp);
- if (ret)
- return -EINVAL;
+ if (strict_strtoull(s[1], 10, &temp))
+ goto out;
/* For rule removal, do not check for device presence. */
if (temp) {
- ret = blkio_check_dev_num(dev);
- if (ret)
- return ret;
+ disk = get_gendisk(dev, &part);
+ if (!disk || part) {
+ ret = -ENODEV;
+ goto out;
+ }
}
newpn->dev = dev;
@@ -843,7 +831,7 @@ static int blkio_policy_parse_and_set(char *buf,
case BLKIO_POLICY_PROP:
if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
temp > BLKIO_WEIGHT_MAX)
- return -EINVAL;
+ goto out;
newpn->plid = plid;
newpn->fileid = fileid;
@@ -860,7 +848,7 @@ static int blkio_policy_parse_and_set(char *buf,
case BLKIO_THROTL_read_iops_device:
case BLKIO_THROTL_write_iops_device:
if (temp > THROTL_IOPS_MAX)
- return -EINVAL;
+ goto out;
newpn->plid = plid;
newpn->fileid = fileid;
@@ -871,8 +859,10 @@ static int blkio_policy_parse_and_set(char *buf,
default:
BUG();
}
-
- return 0;
+ ret = 0;
+out:
+ put_disk(disk);
+ return ret;
}
unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,