linux-kernel - [GIT PULL 1/8] lightnvm: pblk: stop taking the free lock in in pblk_lines

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 11 Feb 2019 13:25:02 +0100
From:   Matias Bjørling <mb@...htnvm.io>
To:     axboe@...com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Holmberg <hans.holmberg@...xlabs.com>,
        Matias Bjørling <mb@...htnvm.io>
Subject: [GIT PULL 1/8] lightnvm: pblk: stop taking the free lock in in pblk_lines_free

From: Hans Holmberg <hans.holmberg@...xlabs.com>

pblk_line_meta_free might sleep (it can end up calling vfree, depending
on how we allocate lba lists), and this can lead to a BUG()
if we wake up on a different cpu and release the lock.

As there is no point of grabbing the free lock when pblk has shut down,
remove the lock.

Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
Signed-off-by: Matias Bjørling <mb@...htnvm.io>
---
 drivers/lightnvm/pblk-init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index f9a3e47b6a93..eb0135c77805 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -584,14 +584,12 @@ static void pblk_lines_free(struct pblk *pblk)
 	struct pblk_line *line;
 	int i;
 
-	spin_lock(&l_mg->free_lock);
 	for (i = 0; i < l_mg->nr_lines; i++) {
 		line = &pblk->lines[i];
 
 		pblk_line_free(line);
 		pblk_line_meta_free(l_mg, line);
 	}
-	spin_unlock(&l_mg->free_lock);
 
 	pblk_line_mg_free(pblk);
 
-- 
2.19.1