linux-kernel - [PATCH] USB: core: remove the move buf action

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Message-ID: <tencent_B32D6D8C9450EBFEEE5ACC2C7B0E6C402D0A@qq.com>
Date: Wed, 10 Sep 2025 15:58:47 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+b6445765657b5855e869@...kaller.appspotmail.com
Cc: dakr@...nel.org,
	gregkh@...uxfoundation.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rafael@...nel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] USB: core: remove the move buf action

The buffer size of sysfs is fixed at PAGE_SIZE, and the page offset
of the buf parameter of sysfs_emit_at() must be 0, there is no need
to manually manage the buf pointer offset.

Fixes: 711d41ab4a0e ("usb: core: Use sysfs_emit_at() when showing dynamic IDs")
Reported-by: syzbot+b6445765657b5855e869@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b6445765657b5855e869
Tested-by: syzbot+b6445765657b5855e869@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 drivers/usb/core/driver.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index c3177034b779..f441958b0ef4 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -119,11 +119,11 @@ ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf)
 	guard(mutex)(&usb_dynids_lock);
 	list_for_each_entry(dynid, &dynids->list, node)
 		if (dynid->id.bInterfaceClass != 0)
-			count += sysfs_emit_at(&buf[count], count, "%04x %04x %02x\n",
+			count += sysfs_emit_at(buf, count, "%04x %04x %02x\n",
 					   dynid->id.idVendor, dynid->id.idProduct,
 					   dynid->id.bInterfaceClass);
 		else
-			count += sysfs_emit_at(&buf[count], count, "%04x %04x\n",
+			count += sysfs_emit_at(buf, count, "%04x %04x\n",
 					   dynid->id.idVendor, dynid->id.idProduct);
 	return count;
 }
-- 
2.43.0