linux-kernel - [PATCH v2] drm: fix a memleak on mutex failure path

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]

Message-Id: <1430149006-3753-1-git-send-email-green@linuxhacker.ru>
Date:	Mon, 27 Apr 2015 11:36:46 -0400
From:	green@...uxhacker.ru
To:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Oleg Drokin <green@...uxhacker.ru>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH v2] drm: fix a memleak on mutex failure path

From: Oleg Drokin <green@...uxhacker.ru>

Need to free just allocated ctx allocation if we cannot
get our config mutex.

This one has been flagged by kbuild bot all the way back in August,
but somehow nobody picked it up:
https://lists.01.org/pipermail/kbuild/2014-August/001691.html

In addition there is another failure path that leaks the same
ctx reference that is fixed.

Found with smatch.

Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
CC: Daniel Vetter <daniel.vetter@...ll.ch>
---
 drivers/gpu/drm/drm_modeset_lock.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 51cc47d..c0a5cd8 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -80,8 +80,10 @@ int __drm_modeset_lock_all(struct drm_device *dev,
 		return -ENOMEM;
 
 	if (trylock) {
-		if (!mutex_trylock(&config->mutex))
-			return -EBUSY;
+		if (!mutex_trylock(&config->mutex)) {
+			ret = -EBUSY;
+			goto out;
+		}
 	} else {
 		mutex_lock(&config->mutex);
 	}
@@ -114,6 +116,8 @@ fail:
 		goto retry;
 	}
 
+out:
+	kfree(ctx);
 	return ret;
 }
 EXPORT_SYMBOL(__drm_modeset_lock_all);
-- 
2.1.0

--
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/