linux-kernel - [PATCH riscv64] kobject: fix WARNING in input_register

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Message-ID: <tencent_AF9E941B3D4BEF1B2625D4BA18BBDA332108@qq.com>
Date: Thu,  8 Feb 2024 18:46:55 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+8e41bb0c055b209ebbf4@...kaller.appspotmail.com
Cc: gregkh@...uxfoundation.org,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	rafael@...nel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH riscv64] kobject: fix WARNING in input_register_device

The input_add_uevent_modalias_var()->input_print_modalias() will add 1684 bytes
of data to env, which will result in insufficient memory allocated to the buf 
members of env.

Reported-and-tested-by: syzbot+8e41bb0c055b209ebbf4@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 include/linux/kobject.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index c30affcc43b4..74b37b6459cd 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -30,7 +30,7 @@
 
 #define UEVENT_HELPER_PATH_LEN		256
 #define UEVENT_NUM_ENVP			64	/* number of env pointers */
-#define UEVENT_BUFFER_SIZE		2048	/* buffer for the variables */
+#define UEVENT_BUFFER_SIZE		2560	/* buffer for the variables */
 
 #ifdef CONFIG_UEVENT_HELPER
 /* path to the userspace helper executed on an event */
-- 
2.43.0