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[Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning

Alistair Francis posted 5 patches 6 years, 6 months ago
[Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning
Posted by Alistair Francis 6 years, 6 months ago 
Fix this build warning with GCC 9 on Fedora 30:
hw/usb/hcd-xhci.c:3339:66: error: ‘%d’ directive output may be truncated writing between 1 and 10 bytes into a region of size 5 [-Werror=format-truncation=]
 3339 |             snprintf(port->name, sizeof(port->name), "usb2 port #%d", i+1);
      |                                                                  ^~
hw/usb/hcd-xhci.c:3339:54: note: directive argument in the range [1, 2147483647]
 3339 |             snprintf(port->name, sizeof(port->name), "usb2 port #%d", i+1);
      |                                                      ^~~~~~~~~~~~~~~
In file included from /usr/include/stdio.h:867,
                 from /home/alistair/qemu/include/qemu/osdep.h:99,
                 from hw/usb/hcd-xhci.c:21:
/usr/include/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output between 13 and 22 bytes into a destination of size 16
   67 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   68 |        __bos (__s), __fmt, __va_arg_pack ());
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 hw/usb/hcd-xhci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index ec28bee319..2b061772b2 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3322,6 +3322,7 @@ static void usb_xhci_init(XHCIState *xhci)
     usb_bus_new(&xhci->bus, sizeof(xhci->bus), &xhci_bus_ops, dev);
 
     for (i = 0; i < usbports; i++) {
+        g_assert(i < MAX(MAXPORTS_2, MAXPORTS_3));
         speedmask = 0;
         if (i < xhci->numports_2) {
             if (xhci_get_flag(xhci, XHCI_FLAG_SS_FIRST)) {
-- 
2.21.0
Re: [Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning
Posted by Laurent Vivier 6 years, 6 months ago 
Le 01/05/2019 à 01:28, Alistair Francis a écrit :
> Fix this build warning with GCC 9 on Fedora 30:
> hw/usb/hcd-xhci.c:3339:66: error: ‘%d’ directive output may be truncated writing between 1 and 10 bytes into a region of size 5 [-Werror=format-truncation=]
>  3339 |             snprintf(port->name, sizeof(port->name), "usb2 port #%d", i+1);
>       |                                                                  ^~
> hw/usb/hcd-xhci.c:3339:54: note: directive argument in the range [1, 2147483647]
>  3339 |             snprintf(port->name, sizeof(port->name), "usb2 port #%d", i+1);
>       |                                                      ^~~~~~~~~~~~~~~
> In file included from /usr/include/stdio.h:867,
>                  from /home/alistair/qemu/include/qemu/osdep.h:99,
>                  from hw/usb/hcd-xhci.c:21:
> /usr/include/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output between 13 and 22 bytes into a destination of size 16
>    67 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    68 |        __bos (__s), __fmt, __va_arg_pack ());
>       |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> ---
>  hw/usb/hcd-xhci.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
> index ec28bee319..2b061772b2 100644
> --- a/hw/usb/hcd-xhci.c
> +++ b/hw/usb/hcd-xhci.c
> @@ -3322,6 +3322,7 @@ static void usb_xhci_init(XHCIState *xhci)
>      usb_bus_new(&xhci->bus, sizeof(xhci->bus), &xhci_bus_ops, dev);
>  
>      for (i = 0; i < usbports; i++) {
> +        g_assert(i < MAX(MAXPORTS_2, MAXPORTS_3));
>          speedmask = 0;
>          if (i < xhci->numports_2) {
>              if (xhci_get_flag(xhci, XHCI_FLAG_SS_FIRST)) {
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Re: [Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning
Posted by Daniel P. Berrangé 6 years, 6 months ago 
On Tue, Apr 30, 2019 at 11:28:31PM +0000, Alistair Francis wrote:
> Fix this build warning with GCC 9 on Fedora 30:
> hw/usb/hcd-xhci.c:3339:66: error: ‘%d’ directive output may be truncated writing between 1 and 10 bytes into a region of size 5 [-Werror=format-truncation=]
>  3339 |             snprintf(port->name, sizeof(port->name), "usb2 port #%d", i+1);
>       |                                                                  ^~
> hw/usb/hcd-xhci.c:3339:54: note: directive argument in the range [1, 2147483647]
>  3339 |             snprintf(port->name, sizeof(port->name), "usb2 port #%d", i+1);
>       |                                                      ^~~~~~~~~~~~~~~
> In file included from /usr/include/stdio.h:867,
>                  from /home/alistair/qemu/include/qemu/osdep.h:99,
>                  from hw/usb/hcd-xhci.c:21:
> /usr/include/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output between 13 and 22 bytes into a destination of size 16
>    67 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    68 |        __bos (__s), __fmt, __va_arg_pack ());
>       |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> ---
>  hw/usb/hcd-xhci.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
> index ec28bee319..2b061772b2 100644
> --- a/hw/usb/hcd-xhci.c
> +++ b/hw/usb/hcd-xhci.c
> @@ -3322,6 +3322,7 @@ static void usb_xhci_init(XHCIState *xhci)
>      usb_bus_new(&xhci->bus, sizeof(xhci->bus), &xhci_bus_ops, dev);
>  
>      for (i = 0; i < usbports; i++) {
> +        g_assert(i < MAX(MAXPORTS_2, MAXPORTS_3));
>          speedmask = 0;
>          if (i < xhci->numports_2) {
>              if (xhci_get_flag(xhci, XHCI_FLAG_SS_FIRST)) {

I proposed a slightly different fix here:

  https://lists.gnu.org/archive/html/qemu-devel/2019-04/msg02125.html

but both have the same effect


  Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
-- 
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Re: [Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning
Posted by Richard Henderson 6 years, 6 months ago 
On 4/30/19 4:28 PM, Alistair Francis wrote:
>      for (i = 0; i < usbports; i++) {
> +        g_assert(i < MAX(MAXPORTS_2, MAXPORTS_3));

I would hope that it works to move this out of the loop:

  g_assert(usbports <= MAX(MAXPORTS_2, MAXPORTS_3));


r~
Re: [Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning
Posted by Philippe Mathieu-Daudé 6 years, 6 months ago 
On 5/1/19 4:12 PM, Richard Henderson wrote:
> On 4/30/19 4:28 PM, Alistair Francis wrote:
>>      for (i = 0; i < usbports; i++) {
>> +        g_assert(i < MAX(MAXPORTS_2, MAXPORTS_3));
> 
> I would hope that it works to move this out of the loop:
> 
>   g_assert(usbports <= MAX(MAXPORTS_2, MAXPORTS_3));

With Richard suggestion:

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Re: [Qemu-devel] [PATCH v2 2/5] hw/usb/hcd-xhci: Fix GCC 9 build warning
Posted by Alistair Francis 6 years, 6 months ago 
On Wed, May 1, 2019 at 7:12 AM Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 4/30/19 4:28 PM, Alistair Francis wrote:
> >      for (i = 0; i < usbports; i++) {
> > +        g_assert(i < MAX(MAXPORTS_2, MAXPORTS_3));
>
> I would hope that it works to move this out of the loop:
>
>   g_assert(usbports <= MAX(MAXPORTS_2, MAXPORTS_3));

Yes, that also works. I have updated the patch.

Alistair

>
>
> r~

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