usb: gadget: avoid variable name clipping in cb_getvar

Hi,

A kind reminder to look at this patch (already reviewed by Marek and acked by Lukasz), and if possible to put it in the next pull list, or the one after is timing is too short.

Thanks in advance for your time

Best Regards
Nicolas

-----Original Message-----
From: Nicolas LE BAYON
Sent: mardi 25 avril 2017 10:18
To: Nicolas LE BAYON <nicolas.le.bayon@st.com>; u-boot@lists.denx.de; lukma@denx.de; marex@denx.de
Cc: nlebayon@gmail.com; Patrice CHOTARD <patrice.chotard@st.com>; Jean-philippe ROMAIN <jean-philippe.romain@st.com>
Subject: [U-Boot][PATCH v7] usb: gadget: avoid variable name clipping in cb_getvar

From: Nicolas Le Bayon <nicolas.le.bayon@st.com>

Instead of using a fixed-size array to store variable name, preferring a dynamic allocation treats correctly all variable name lengths.
Variable names are growing through releases and features. By this way, name clipping is prevented.

Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Lukasz Majewski <lukma@denx.de>

diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index 2160b1ccdc3d93a658e0f28161322b4292a49aaf..7cd6d24bf50ea5839d0af1fb17738c2df1ae5381 100644 (file)
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -432,9 +432,15 @@ static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
                else
                        strcpy(response, "FAILValue not set");
        } else {
-               char envstr[32];
+               char *envstr;
 
-               snprintf(envstr, sizeof(envstr) - 1, "fastboot.%s", cmd);
+               envstr = malloc(strlen("fastboot.") + strlen(cmd) + 1);
+               if (!envstr) {
+                       fastboot_tx_write_str("FAILmalloc error");
+                       return;
+               }
+
+               sprintf(envstr, "fastboot.%s", cmd);
                s = getenv(envstr);
                if (s) {
                        strncat(response, s, chars_left);
@@ -442,6 +448,8 @@ static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
                        printf("WARNING: unknown variable: %s\n", cmd);
                        strcpy(response, "FAILVariable not implemented");
                }
+
+               free(envstr);
        }
        fastboot_tx_write_str(response);
 }