From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 27 Aug 2024 14:21:40 +0000 (+0200)
Subject: 4.19-stable patches
X-Git-Tag: v6.1.107~13
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9dfa73ede5228997ecd60865bfd5d136d0098a1d;p=thirdparty%2Fkernel%2Fstable-queue.git

4.19-stable patches

added patches:
	input-mt-limit-max-slots.patch
---

diff --git a/queue-4.19/input-mt-limit-max-slots.patch b/queue-4.19/input-mt-limit-max-slots.patch
new file mode 100644
index 00000000000..868e147c997
--- /dev/null
+++ b/queue-4.19/input-mt-limit-max-slots.patch
@@ -0,0 +1,37 @@
+From 99d3bf5f7377d42f8be60a6b9cb60fb0be34dceb Mon Sep 17 00:00:00 2001
+From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
+Date: Mon, 29 Jul 2024 21:51:30 +0900
+Subject: Input: MT - limit max slots
+
+From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
+
+commit 99d3bf5f7377d42f8be60a6b9cb60fb0be34dceb upstream.
+
+syzbot is reporting too large allocation at input_mt_init_slots(), for
+num_slots is supplied from userspace using ioctl(UI_DEV_CREATE).
+
+Since nobody knows possible max slots, this patch chose 1024.
+
+Reported-by: syzbot <syzbot+0122fa359a69694395d5@syzkaller.appspotmail.com>
+Closes: https://syzkaller.appspot.com/bug?extid=0122fa359a69694395d5
+Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
+Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: George Kennedy <george.kennedy@oracle.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/input/input-mt.c |    3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/drivers/input/input-mt.c
++++ b/drivers/input/input-mt.c
+@@ -48,6 +48,9 @@ int input_mt_init_slots(struct input_dev
+ 		return 0;
+ 	if (mt)
+ 		return mt->num_slots != num_slots ? -EINVAL : 0;
++	/* Arbitrary limit for avoiding too large memory allocation. */
++	if (num_slots > 1024)
++		return -EINVAL;
+ 
+ 	mt = kzalloc(struct_size(mt, slots, num_slots), GFP_KERNEL);
+ 	if (!mt)
diff --git a/queue-4.19/series b/queue-4.19/series
index fa8cfdac6ee..4d1019e2e8c 100644
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -67,3 +67,4 @@ cxgb4-add-forgotten-u64-ivlan-cast-before-shift.patch
 mmc-dw_mmc-allow-biu-and-ciu-clocks-to-defer.patch
 alsa-timer-relax-start-tick-time-check-for-slave-timer-elements.patch
 bluetooth-hci_ldisc-check-hci_uart_proto_ready-flag-in-hciuartgetproto.patch
+input-mt-limit-max-slots.patch