From b222dd2fdd53a40dd8f1d3082ae98e52883cce0d Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Mon, 10 Jul 2017 11:40:17 -0700 Subject: block: call bio_uninit in bio_endio bio_free isn't a good place to free cgroup info. There are a lot of cases bio is allocated in special way (for example, in stack) and never gets called by bio_put hence bio_free, we are leaking memory. This patch moves the free to bio endio, which should be called anyway. The bio_uninit call in bio_free is kept, in case the bio never gets called bio endio. This assumes ->bi_end_io() doesn't access cgroup info, which seems true in my audit. This along with Christoph's integrity patch should fix the memory leak issue. Cc: Christoph Hellwig Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe --- block/bio.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'block/bio.c') diff --git a/block/bio.c b/block/bio.c index 9cabf5d0be20..9a63597aaacc 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1833,6 +1833,8 @@ again: } blk_throtl_bio_endio(bio); + /* release cgroup info */ + bio_uninit(bio); if (bio->bi_end_io) bio->bi_end_io(bio); } -- cgit