| Message ID | 1592201855-8218-1-git-send-email-macpaul.lin@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] usb: replace hardcode maximum usb string length by definition | expand |
On Mon, Jun 15, 2020 at 02:17:35PM +0800, Macpaul Lin wrote: > Replace hardcode maximum usb string length (126 bytes) by definition > "MAX_USB_STRING_LEN". > > Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> > --- > Changes for v2: > - Add definition "MAX_USB_STRING_LEN" in ch9.h instead of in usb.h. > Thanks for Alan's suggestion. Acked-by: Alan Stern <stern@rowland.harvard.edu>
On Mon, Jun 15, 2020 at 02:17:35PM +0800, Macpaul Lin wrote: > Replace hardcode maximum usb string length (126 bytes) by definition > "MAX_USB_STRING_LEN". > > Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> > --- > Changes for v2: > - Add definition "MAX_USB_STRING_LEN" in ch9.h instead of in usb.h. > Thanks for Alan's suggestion. > > drivers/usb/gadget/composite.c | 4 ++-- > drivers/usb/gadget/configfs.c | 2 +- > drivers/usb/gadget/usbstring.c | 4 ++-- > include/uapi/linux/usb/ch9.h | 3 +++ > 4 files changed, 8 insertions(+), 5 deletions(-) This patch fails to apply to my tree (or to 5.8-rc1). Please rebase it and resend. thanks, greg k-h
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index cb4950c..d0de016 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1041,7 +1041,7 @@ static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) while (*sp) { s = *sp; language = cpu_to_le16(s->language); - for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { + for (tmp = buf; *tmp && tmp < &buf[MAX_USB_STRING_LEN]; tmp++) { if (*tmp == language) goto repeat; } @@ -1116,7 +1116,7 @@ static int get_string(struct usb_composite_dev *cdev, collect_langs(sp, s->wData); } - for (len = 0; len <= 126 && s->wData[len]; len++) + for (len = 0; len <= MAX_USB_STRING_LEN && s->wData[len]; len++) continue; if (!len) return -EINVAL; diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c index 32b637e..70dd4ba 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -115,7 +115,7 @@ static int usb_string_copy(const char *s, char **s_copy) char *str; char *copy = *s_copy; ret = strlen(s); - if (ret > 126) + if (ret > MAX_USB_STRING_LEN) return -EOVERFLOW; str = kstrdup(s, GFP_KERNEL); diff --git a/drivers/usb/gadget/usbstring.c b/drivers/usb/gadget/usbstring.c index 7c24d1c..8a8d647 100644 --- a/drivers/usb/gadget/usbstring.c +++ b/drivers/usb/gadget/usbstring.c @@ -55,9 +55,9 @@ return -EINVAL; /* string descriptors have length, tag, then UTF16-LE text */ - len = min((size_t) 126, strlen (s->s)); + len = min((size_t)MAX_USB_STRING_LEN, strlen(s->s)); len = utf8s_to_utf16s(s->s, len, UTF16_LITTLE_ENDIAN, - (wchar_t *) &buf[2], 126); + (wchar_t *) &buf[2], MAX_USB_STRING_LEN); if (len < 0) return -EINVAL; buf [0] = (len + 1) * 2; diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h index 2b623f3..cc02d05 100644 --- a/include/uapi/linux/usb/ch9.h +++ b/include/uapi/linux/usb/ch9.h @@ -364,6 +364,9 @@ struct usb_config_descriptor { /*-------------------------------------------------------------------------*/ +/* USB String descriptors can contain at most 126 characters. */ +#define MAX_USB_STRING_LEN 126 + /* USB_DT_STRING: String descriptor */ struct usb_string_descriptor { __u8 bLength;
Replace hardcode maximum usb string length (126 bytes) by definition "MAX_USB_STRING_LEN". Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- Changes for v2: - Add definition "MAX_USB_STRING_LEN" in ch9.h instead of in usb.h. Thanks for Alan's suggestion. drivers/usb/gadget/composite.c | 4 ++-- drivers/usb/gadget/configfs.c | 2 +- drivers/usb/gadget/usbstring.c | 4 ++-- include/uapi/linux/usb/ch9.h | 3 +++ 4 files changed, 8 insertions(+), 5 deletions(-)