[PATCH 0/6] Use safer strscpy() instead of strcpy()

[PATCH 0/6] Use safer strscpy() instead of strcpy()

[Ai Chao]

This patch series introduces wrapper functions strscpy().

Use a safer function strscpy() instead of strcpy() for copying to arrays.

Only idiomatic code replacement, and no functional changes.

Summary:

 - Patch 1 USB: serial: ti_usb_3410_5052: Use safer strscpy() instead of strcpy()
 - Patch 2 usb: musb: Use safer strscpy() instead of strcpy()
 - Patch 3 usb: gadget: functionfs: Use safer strscpy() instead of strcpy()
 - Patch 4 usb: typec: tcpm: Use safer strscpy() instead of strcpy()
 - Patch 5 usb: gadget: udc: Use safer strscpy() instead of strcpy()
 - Patch 6 usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

 drivers/usb/gadget/function/f_midi2.c  |  6 +++---
 drivers/usb/gadget/function/u_serial.c |  2 +-
 drivers/usb/gadget/udc/snps_udc_core.c |  2 +-
 drivers/usb/musb/musb_core.c           |  2 +-
 drivers/usb/serial/ti_usb_3410_5052.c  | 16 ++++++++--------
 drivers/usb/typec/tcpm/tcpm.c          |  6 +++---
 drivers/usb/usbip/vhci_sysfs.c         |  2 +-
 7 files changed, 18 insertions(+), 18 deletions(-)

-- 
2.34.1

[PATCH 1/6] USB: serial: ti_usb_3410_5052: Use safer strscpy() instead of strcpy()

[Ai Chao]

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
---
 drivers/usb/serial/ti_usb_3410_5052.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 658b54d8fcef..b3591d6d7645 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -1600,29 +1600,29 @@ static int ti_download_firmware(struct ti_device *tdev)
 		if (le16_to_cpu(dev->descriptor.idVendor) == MTS_VENDOR_ID) {
 			switch (le16_to_cpu(dev->descriptor.idProduct)) {
 			case MTS_CDMA_PRODUCT_ID:
-				strcpy(buf, "mts_cdma.fw");
+				strscpy(buf, "mts_cdma.fw");
 				break;
 			case MTS_GSM_PRODUCT_ID:
-				strcpy(buf, "mts_gsm.fw");
+				strscpy(buf, "mts_gsm.fw");
 				break;
 			case MTS_EDGE_PRODUCT_ID:
-				strcpy(buf, "mts_edge.fw");
+				strscpy(buf, "mts_edge.fw");
 				break;
 			case MTS_MT9234MU_PRODUCT_ID:
-				strcpy(buf, "mts_mt9234mu.fw");
+				strscpy(buf, "mts_mt9234mu.fw");
 				break;
 			case MTS_MT9234ZBA_PRODUCT_ID:
-				strcpy(buf, "mts_mt9234zba.fw");
+				strscpy(buf, "mts_mt9234zba.fw");
 				break;
 			case MTS_MT9234ZBAOLD_PRODUCT_ID:
-				strcpy(buf, "mts_mt9234zba.fw");
+				strscpy(buf, "mts_mt9234zba.fw");
 				break;			}
 		}
 		if (buf[0] == '\0') {
 			if (tdev->td_is_3410)
-				strcpy(buf, "ti_3410.fw");
+				strscpy(buf, "ti_3410.fw");
 			else
-				strcpy(buf, "ti_5052.fw");
+				strscpy(buf, "ti_5052.fw");
 		}
 		status = request_firmware(&fw_p, buf, &dev->dev);
 	}
-- 
2.34.1

Re: [PATCH 1/6] USB: serial: ti_usb_3410_5052: Use safer strscpy() instead of strcpy()

[Johan Hovold]

On Tue, Mar 10, 2026 at 05:44:29PM +0800, Ai Chao wrote:
> Use a safer function strscpy() instead of strcpy() for copying to
> arrays.
> 
> Only idiomatic code replacement, and no functional changes.
> 
> Signed-off-by: Ai Chao <aichao@kylinos.cn>
> ---

I've applied this one (1/6) for 7.1. Thanks.

Johan

[PATCH 2/6] usb: musb: Use safer strscpy() instead of strcpy()

[Ai Chao]

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
---
 drivers/usb/musb/musb_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 0acc62569ae5..73ac25f53698 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1600,7 +1600,7 @@ static int musb_core_init(u16 musb_type, struct musb *musb)
 	/* log core options (read using indexed model) */
 	reg = musb_read_configdata(mbase);
 
-	strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
+	strscpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
 	if (reg & MUSB_CONFIGDATA_DYNFIFO) {
 		strcat(aInfo, ", dyn FIFOs");
 		musb->dyn_fifo = true;
-- 
2.34.1

[PATCH 3/6] usb: gadget: functionfs: Use safer strscpy() instead of strcpy()

[Ai Chao]

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
---
 drivers/usb/gadget/function/f_midi2.c  | 6 +++---
 drivers/usb/gadget/function/u_serial.c | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/function/f_midi2.c b/drivers/usb/gadget/function/f_midi2.c
index b5f0defde95d..19fdac024343 100644
--- a/drivers/usb/gadget/function/f_midi2.c
+++ b/drivers/usb/gadget/function/f_midi2.c
@@ -1541,9 +1541,9 @@ static int f_midi2_create_card(struct f_midi2 *midi2)
 		return err;
 	midi2->card = card;
 
-	strcpy(card->driver, "f_midi2");
-	strcpy(card->shortname, "MIDI 2.0 Gadget");
-	strcpy(card->longname, "MIDI 2.0 Gadget");
+	strscpy(card->driver, "f_midi2");
+	strscpy(card->shortname, "MIDI 2.0 Gadget");
+	strscpy(card->longname, "MIDI 2.0 Gadget");
 
 	id = 0;
 	for (i = 0; i < midi2->num_eps; i++) {
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index e43ad6373846..cdd1dfc666c4 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -1086,7 +1086,7 @@ static int gs_console_init(struct gs_port *port)
 	if (!cons)
 		return -ENOMEM;
 
-	strcpy(cons->console.name, "ttyGS");
+	strscpy(cons->console.name, "ttyGS");
 	cons->console.write = gs_console_write;
 	cons->console.device = gs_console_device;
 	cons->console.flags = CON_PRINTBUFFER;
-- 
2.34.1

[PATCH 4/6] usb: typec: tcpm: Use safer strscpy() instead of strcpy()

[Ai Chao]

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
---
 drivers/usb/typec/tcpm/tcpm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 1d2f3af034c5..8d939ffb9ac7 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -725,7 +725,7 @@ static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 
 	if (tcpm_log_full(port)) {
 		port->logbuffer_head = max(port->logbuffer_head - 1, 0);
-		strcpy(tmpbuffer, "overflow");
+		strscpy(tmpbuffer, "overflow");
 	}
 
 	if (port->logbuffer_head < 0 ||
@@ -841,10 +841,10 @@ static void tcpm_log_source_caps(struct tcpm_port *port)
 					  pdo_spr_avs_apdo_15v_to_20v_max_current_ma(pdo),
 					  pdo_spr_avs_apdo_src_peak_current(pdo));
 			else
-				strcpy(msg, "undefined APDO");
+				strscpy(msg, "undefined APDO");
 			break;
 		default:
-			strcpy(msg, "undefined");
+			strscpy(msg, "undefined");
 			break;
 		}
 		tcpm_log(port, " PDO %d: type %d, %s",
-- 
2.34.1

[PATCH 5/6] usb: gadget: udc: Use safer strscpy() instead of strcpy()

[Ai Chao]

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
---
 drivers/usb/gadget/udc/snps_udc_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/snps_udc_core.c b/drivers/usb/gadget/udc/snps_udc_core.c
index 5f9514623956..0e0db68e0b27 100644
--- a/drivers/usb/gadget/udc/snps_udc_core.c
+++ b/drivers/usb/gadget/udc/snps_udc_core.c
@@ -3151,7 +3151,7 @@ int udc_probe(struct udc *dev)
 			 tmp, dev->phys_addr, dev->chiprev,
 			 (dev->chiprev == UDC_HSA0_REV) ?
 			 "A0" : "B1");
-		strcpy(tmp, UDC_DRIVER_VERSION_STRING);
+		strscpy(tmp, UDC_DRIVER_VERSION_STRING);
 		if (dev->chiprev == UDC_HSA0_REV) {
 			dev_err(dev->dev, "chip revision is A0; too old\n");
 			retval = -ENODEV;
-- 
2.34.1

[PATCH 6/6] usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

[Ai Chao]

Use a safer function strscpy() instead of strcpy() for copying to
arrays.

Only idiomatic code replacement, and no functional changes.

Signed-off-by: Ai Chao <aichao@kylinos.cn>
---
 drivers/usb/usbip/vhci_sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/usbip/vhci_sysfs.c b/drivers/usb/usbip/vhci_sysfs.c
index bfc10f665e52..5bc8c47788d4 100644
--- a/drivers/usb/usbip/vhci_sysfs.c
+++ b/drivers/usb/usbip/vhci_sysfs.c
@@ -463,7 +463,7 @@ static void set_status_attr(int id)
 
 	status = status_attrs + id;
 	if (id == 0)
-		strcpy(status->name, "status");
+		strscpy(status->name, "status");
 	else
 		snprintf(status->name, MAX_STATUS_NAME+1, "status.%d", id);
 	status->attr.attr.name = status->name;
-- 
2.34.1

Re: [PATCH 6/6] usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

[Shuah Khan]

On 3/10/26 03:44, Ai Chao wrote:
> Use a safer function strscpy() instead of strcpy() for copying to
> arrays.
> 
> Only idiomatic code replacement, and no functional changes.

It is a functional change since it calls a new routine. Get rid
of this line from change log.

How did you test this patch? I am curious because of you are
describing the change as "idiomatic code replacement"

> 
> Signed-off-by: Ai Chao <aichao@kylinos.cn>
> ---
>   drivers/usb/usbip/vhci_sysfs.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/usbip/vhci_sysfs.c b/drivers/usb/usbip/vhci_sysfs.c
> index bfc10f665e52..5bc8c47788d4 100644
> --- a/drivers/usb/usbip/vhci_sysfs.c
> +++ b/drivers/usb/usbip/vhci_sysfs.c
> @@ -463,7 +463,7 @@ static void set_status_attr(int id)
>   
>   	status = status_attrs + id;
>   	if (id == 0)
> -		strcpy(status->name, "status");
> +		strscpy(status->name, "status");
>   	else
>   		snprintf(status->name, MAX_STATUS_NAME+1, "status.%d", id);
>   	status->attr.attr.name = status->name;

thanks,
-- Shuah

Re: [PATCH 6/6] usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

[Dan Carpenter]

On Tue, Mar 10, 2026 at 04:10:20PM -0600, Shuah Khan wrote:
> On 3/10/26 03:44, Ai Chao wrote:
> > Use a safer function strscpy() instead of strcpy() for copying to
> > arrays.
> > 
> > Only idiomatic code replacement, and no functional changes.
> 
> It is a functional change since it calls a new routine. Get rid
> of this line from change log.
> 
> How did you test this patch? I am curious because of you are
> describing the change as "idiomatic code replacement"
> 

I liked the commit message...  To me it says that patch affect
runtime.  It doesn' fix any bugs or introduce any bugs.  Too often
these changes are sold as a "potential" bugfix, which means people
haven't bothered to check whether it fixes a bug or not.

It's the right thing to add a note under the --- cut off that the
patch hasn't been tested.  Testing isn't required for this sort
of patch but a note is good so reviewers will know to be careful.

regards,
dan carpenter

Re: [PATCH 6/6] usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

[Shuah Khan]

On 3/11/26 01:22, Dan Carpenter wrote:
> On Tue, Mar 10, 2026 at 04:10:20PM -0600, Shuah Khan wrote:
>> On 3/10/26 03:44, Ai Chao wrote:
>>> Use a safer function strscpy() instead of strcpy() for copying to
>>> arrays.
>>>
>>> Only idiomatic code replacement, and no functional changes.
>>
>> It is a functional change since it calls a new routine. Get rid
>> of this line from change log.
>>
>> How did you test this patch? I am curious because of you are
>> describing the change as "idiomatic code replacement"
>>
> 
> I liked the commit message...  To me it says that patch affect
> runtime.  It doesn' fix any bugs or introduce any bugs.  Too often
> these changes are sold as a "potential" bugfix, which means people
> haven't bothered to check whether it fixes a bug or not.
> 
> It's the right thing to add a note under the --- cut off that the
> patch hasn't been tested.  Testing isn't required for this sort
> of patch but a note is good so reviewers will know to be careful.

I would like to see some sort of testing for patches like this one.
It isn't hard to test this change.

thanks,
-- Shuah

Re: [PATCH 6/6] usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

[Dan Carpenter]

On Tue, Mar 24, 2026 at 03:34:03PM -0600, Shuah Khan wrote:
> On 3/11/26 01:22, Dan Carpenter wrote:
> > On Tue, Mar 10, 2026 at 04:10:20PM -0600, Shuah Khan wrote:
> > > On 3/10/26 03:44, Ai Chao wrote:
> > > > Use a safer function strscpy() instead of strcpy() for copying to
> > > > arrays.
> > > > 
> > > > Only idiomatic code replacement, and no functional changes.
> > > 
> > > It is a functional change since it calls a new routine. Get rid
> > > of this line from change log.
> > > 
> > > How did you test this patch? I am curious because of you are
> > > describing the change as "idiomatic code replacement"
> > > 
> > 
> > I liked the commit message...  To me it says that patch affect
> > runtime.  It doesn' fix any bugs or introduce any bugs.  Too often
> > these changes are sold as a "potential" bugfix, which means people
> > haven't bothered to check whether it fixes a bug or not.
> > 
> > It's the right thing to add a note under the --- cut off that the
> > patch hasn't been tested.  Testing isn't required for this sort
> > of patch but a note is good so reviewers will know to be careful.
> 
> I would like to see some sort of testing for patches like this one.
> It isn't hard to test this change.

It would take me a while to figure out how to test this. :P Presumably,
it's:

sudo ./tools/testing/selftests/drivers/usb/usbip/usbip_test.sh -b<busid> -p tools/usb/usbip/

but I couldn't figure out what to supply for a busid...  Does
kernel-ci do usbip testing?

regards,
dan carpenter

Re: [PATCH 6/6] usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()

[Shuah Khan]

On 3/25/26 04:57, 艾超 wrote:
> Dear Shuah:
> 
> Test Report for [usbip: vhci_sysfs: Use safer strscpy() instead of strcpy()]
> Environment:
> Kernel Version: v6.12.76+ (with patch applied)
> Hardware/QEMU: Thinkpad E15


> Conclusion:
> The longth of the name is MAX_STATUS_NAME+1 = 17, used the strcpy copy "status-abcdefghijklmnopqrstuvwxyz1234567890" in name and used strscpy copy "status-abcdefghi" in name.
> Tested-by: Aichao@kylinos.cn
> 

Thank you for the report.

Acked-by: Shuah Khan <skhan@linuxfoundation.org>

Greg, Please pick this patch up.

thanks,
-- Shuah