linux-kernel - [PATCH V2 RESEND] drm_crtc: check if fb

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:	Wed, 23 Jan 2013 11:19:27 +0800
From:	"Su, Xuemin" <xuemin.su@...el.com>
To:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc:	bo.he@...el.com, xuemin.su@...el.com, yanmin_zhang@...ux.intel.com
Subject: [PATCH V2 RESEND] drm_crtc: check if fb_create return NULL

From: xueminsu <xuemin.su@...el.com>
Date: Tue, 22 Jan 2013 22:39:39 +0800
Subject: [PATCH] drm_crtc: check if fb_create return NULL

Some buggy driver may still return NULL in fb_create,
which leads to kernel panic.

Signed-off-by: xueminsu <xuemin.su@...el.com>
---
 drivers/gpu/drm/drm_crtc.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index f2d667b..b748498 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2172,6 +2172,13 @@ int drm_mode_addfb(struct drm_device *dev,
 		ret = PTR_ERR(fb);
 		goto out;
 	}
+	/* some buggy driver may return NULL here, which may cause panic */
+	if (!fb) {
+		WARN(1, "%pf should not return NULL.",
+			dev->mode_config.funcs->fb_create);
+		ret = -EINVAL;
+		goto out;
+	}
 
 	or->fb_id = fb->base.id;
 	list_add(&fb->filp_head, &file_priv->fbs);
-- 
1.7.6




--
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/