diff options
| author | Macpaul Lin <macpaul.lin@mediatek.com> | 2020-06-18 12:13:38 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-18 17:07:57 +0300 |
| commit | 81c7462883b0cc0a4eeef0687f80ad5b5baee5f6 (patch) | |
| tree | 5f1cb16db49460e9a7947deb8fb65e23a1526cb1 | |
| parent | cda37dbbf17a3a49d434bd1c85eff762faebf3ef (diff) | |
| download | linux-81c7462883b0cc0a4eeef0687f80ad5b5baee5f6.tar.xz | |
USB: replace hardcode maximum usb string length by definition
Replace hardcoded maximum USB string length (126 bytes) by definition
"USB_MAX_STRING_LEN".
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/1592471618-29428-1-git-send-email-macpaul.lin@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/composite.c | 4 | ||||
| -rw-r--r-- | drivers/usb/gadget/configfs.c | 2 | ||||
| -rw-r--r-- | drivers/usb/gadget/usbstring.c | 4 | ||||
| -rw-r--r-- | include/uapi/linux/usb/ch9.h | 3 |
4 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 5c1eb96a5c57..8fbf73467fef 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1085,7 +1085,7 @@ 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[USB_MAX_STRING_LEN]; tmp++) { if (*tmp == language) goto repeat; } @@ -1160,7 +1160,7 @@ 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 <= USB_MAX_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 9dc06a4e1b30..56051bb97349 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -103,7 +103,7 @@ 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 > USB_MAX_STRING_LEN) return -EOVERFLOW; str = kstrdup(s, GFP_KERNEL); diff --git a/drivers/usb/gadget/usbstring.c b/drivers/usb/gadget/usbstring.c index 58a4d3325090..30f889ad3ad2 100644 --- a/drivers/usb/gadget/usbstring.c +++ b/drivers/usb/gadget/usbstring.c @@ -55,9 +55,9 @@ usb_gadget_get_string (const struct usb_gadget_strings *table, int id, u8 *buf) return -EINVAL; /* string descriptors have length, tag, then UTF16-LE text */ - len = min ((size_t) 126, strlen (s->s)); + len = min((size_t)USB_MAX_STRING_LEN, strlen(s->s)); len = utf8s_to_utf16s(s->s, len, UTF16_LITTLE_ENDIAN, - (wchar_t *) &buf[2], 126); + (wchar_t *) &buf[2], USB_MAX_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 456ab0c2b586..b1ed2ccfe9cf 100644 --- a/include/uapi/linux/usb/ch9.h +++ b/include/uapi/linux/usb/ch9.h @@ -368,6 +368,9 @@ struct usb_config_descriptor { /*-------------------------------------------------------------------------*/ +/* USB String descriptors can contain at most 126 characters. */ +#define USB_MAX_STRING_LEN 126 + /* USB_DT_STRING: String descriptor */ struct usb_string_descriptor { __u8 bLength; |