linux-kernel - Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in usbtmc

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Message-ID: <20250817060739.4907-1-hdanton@sina.com>
Date: Sun, 17 Aug 2025 14:07:38 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+abbfd103085885cf16a2@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in usbtmc_interrupt

> Date: Fri, 15 Aug 2025 20:07:34 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    931e46dcbc7e Add linux-next specific files for 20250814
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=11ef65a2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bb7fbecfa2364d1c
> dashboard link: https://syzkaller.appspot.com/bug?extid=abbfd103085885cf16a2
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a99842580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17108da2580000

#syz test

--- x/fs/smb/server/transport_rdma.h
+++ y/fs/smb/server/transport_rdma.h
@@ -61,7 +61,7 @@ void init_smbd_max_io_size(unsigned int
 unsigned int get_smbd_max_read_write_size(void);
 #else
 static inline int ksmbd_rdma_init(void) { return 0; }
-static inline void ksmbd_rdma_stop_listening(void) { return };
+static inline void ksmbd_rdma_stop_listening(void) { }
 static inline void ksmbd_rdma_destroy(void) { return; }
 static inline bool ksmbd_rdma_capable_netdev(struct net_device *netdev) { return false; }
 static inline void init_smbd_max_io_size(unsigned int sz) { }
--- x/drivers/usb/class/usbtmc.c
+++ y/drivers/usb/class/usbtmc.c
@@ -2453,7 +2453,7 @@ static int usbtmc_probe(struct usb_inter
 		kref_get(&data->kref);
 
 		/* allocate buffer for interrupt in */
-		data->iin_buffer = kmalloc(data->iin_wMaxPacketSize,
+		data->iin_buffer = kzalloc(max(256, data->iin_wMaxPacketSize),
 					GFP_KERNEL);
 		if (!data->iin_buffer) {
 			retcode = -ENOMEM;
--