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authorTejun Heo <tj@kernel.org>2015-08-19 00:55:07 +0300
committerJens Axboe <axboe@fb.com>2015-08-19 01:49:16 +0300
commit994b78327458ea14a1743196ee0560c73ace37f3 (patch)
tree00b10beb44185de1f5739e7c393959ce268c3296 /block/blk-cgroup.c
parent401efbf835040dd2ebca54f78d58fc8e3c51f91d (diff)
downloadlinux-994b78327458ea14a1743196ee0560c73ace37f3.tar.xz
blkcg: use blkg_free() in blkcg_init_queue() failure path
When blkcg_init_queue() fails midway after creating a new blkg, it performs kfree() directly; however, this doesn't free the policy data areas. Make it use blkg_free() instead. In turn, blkg_free() is updated to handle root request_list special case. While this fixes a possible memory leak, it's on an unlikely failure path of an already cold path and the size leaked per occurrence is miniscule too. I don't think it needs to be tagged for -stable. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-cgroup.c')
-rw-r--r--block/blk-cgroup.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 1db904f95502..cd251830038a 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -70,7 +70,8 @@ static void blkg_free(struct blkcg_gq *blkg)
for (i = 0; i < BLKCG_MAX_POLS; i++)
kfree(blkg->pd[i]);
- blk_exit_rl(&blkg->rl);
+ if (blkg->blkcg != &blkcg_root)
+ blk_exit_rl(&blkg->rl);
kfree(blkg);
}
@@ -938,7 +939,7 @@ int blkcg_init_queue(struct request_queue *q)
radix_tree_preload_end();
if (IS_ERR(blkg)) {
- kfree(new_blkg);
+ blkg_free(new_blkg);
return PTR_ERR(blkg);
}