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>] [day] [month] [year] [list]
Date: Fri,  5 Apr 2024 10:44:46 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Input: psmouse: add NULL check to psmouse_from_serio()

The serio drvdata can be still NULL while the PS/2 interrupt is
processed.  This leaded to crash with a NULL dereference Oops, as
psmouse_from_serio() blindly assumes the non-NULL ps2dev object.

Add a NULL check and return NULL from psmouse_from_serio().  The
returned NULL is handled properly in the caller side, skipping the
rest gracefully.

The log in the bugzilla entry showed that the probe of synaptics
driver succeeded after that point.  So this is a stop-gap solution.

Link: https://bugzilla.suse.com/show_bug.cgi?id=1219522
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---

 drivers/input/mouse/psmouse-base.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index a0aac76b1e41..fdeee7578d18 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -120,6 +120,8 @@ struct psmouse *psmouse_from_serio(struct serio *serio)
 {
 	struct ps2dev *ps2dev = serio_get_drvdata(serio);
 
+	if (!ps2dev)
+		return NULL;
 	return container_of(ps2dev, struct psmouse, ps2dev);
 }
 
-- 
2.43.0


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ