[PATCH] usb: replace hardcoded maximum usb string length by definition
From: Macpaul Lin <macpaul.lin@mediatek.com>
Date: 2020-06-12 05:33:02
Also in:
linux-arm-kernel, linux-usb, lkml
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
Replace hardcoded maximum usb string length (126 bytes) by definition "MAX_USB_STRING_LEN". Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- drivers/usb/gadget/composite.c | 4 ++-- drivers/usb/gadget/configfs.c | 3 ++- drivers/usb/gadget/usbstring.c | 5 +++-- include/linux/usb.h | 2 ++ 4 files changed, 9 insertions(+), 5 deletions(-)
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..c9d61ac 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c@@ -4,6 +4,7 @@ #include <linux/slab.h> #include <linux/device.h> #include <linux/nls.h> +#include <linux/usb.h> #include <linux/usb/composite.h> #include <linux/usb/gadget_configfs.h> #include "configfs.h"
@@ -115,7 +116,7 @@ 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..c125d59 100644
--- a/drivers/usb/gadget/usbstring.c
+++ b/drivers/usb/gadget/usbstring.c@@ -11,6 +11,7 @@ #include <linux/device.h> #include <linux/nls.h> +#include <linux/usb.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h>
@@ -55,9 +56,9 @@ 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/linux/usb.h b/include/linux/usb.h
index 9f3c721..df4a9cb 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h@@ -1815,6 +1815,8 @@ static inline int usb_get_ptm_status(struct usb_device *dev, void *data) 0, data); } +/* USB String descriptors can contain at most 126 characters. */ +#define MAX_USB_STRING_LEN 126 extern int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
--
1.7.9.5
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