linux-kernel - [PATCH] dm: ioctl: prevent double freeing

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-next>] [day] [month] [year] [list]

Date:	Fri,  4 Sep 2015 16:52:39 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	Neil Brown <neilb@...e.com>
Cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] dm: ioctl: prevent double freeing

DM_PARAMS_KMALLOC and DM_PARAMS_VMALLOC should never be set together in
param_flags. We are setting these flags while allocating so we know that
there is almost no chance of having these two set together but still we
can have some additional safety.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/md/dm-ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 80a4395..aaad74e 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1680,7 +1680,7 @@ static void free_params(struct dm_ioctl *param, size_t param_size, int param_fla
 
 	if (param_flags & DM_PARAMS_KMALLOC)
 		kfree(param);
-	if (param_flags & DM_PARAMS_VMALLOC)
+	else if (param_flags & DM_PARAMS_VMALLOC)
 		vfree(param);
 }
 
-- 
1.9.1

--
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/