linux-kernel - [PATCH 09/13] lightnvm: prevent double free on init error

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]

Message-Id: <1447684487-25539-10-git-send-email-m@bjorling.me>
Date:	Mon, 16 Nov 2015 15:34:43 +0100
From:	Matias Bjørling <m@...rling.me>
To:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nvme@...ts.infradead.org, axboe@...com
Cc:	Matias Bjørling <m@...rling.me>
Subject: [PATCH 09/13] lightnvm: prevent double free on init error

Both the nvm_register and nvm_init does a kfree(dev) on error. Make sure
to only free it once.

Signed-off-by: Matias Bjørling <m@...rling.me>
---
 drivers/lightnvm/core.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 40e6cfa..899f6b9 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -160,11 +160,6 @@ int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
 }
 EXPORT_SYMBOL(nvm_erase_blk);
 
-static void nvm_core_free(struct nvm_dev *dev)
-{
-	kfree(dev);
-}
-
 static int nvm_core_init(struct nvm_dev *dev)
 {
 	struct nvm_id *id = &dev->identity;
@@ -223,8 +218,6 @@ static void nvm_free(struct nvm_dev *dev)
 
 	if (dev->mt)
 		dev->mt->unregister_mgr(dev);
-
-	nvm_core_free(dev);
 }
 
 static int nvm_init(struct nvm_dev *dev)
@@ -351,11 +344,12 @@ void nvm_unregister(char *disk_name)
 		return;
 	}
 
-	nvm_exit(dev);
-
 	down_write(&nvm_lock);
 	list_del(&dev->devices);
 	up_write(&nvm_lock);
+
+	nvm_exit(dev);
+	kfree(dev);
 }
 EXPORT_SYMBOL(nvm_unregister);
 
-- 
2.1.4

--
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/