package/swconfig: add sanity checks to prevent a segfault

[openwrt.git] / package / swconfig / src / swlib.c

diff --git a/package/swconfig/src/swlib.c b/package/swconfig/src/swlib.c
index 59456a3..c2316d0 100644 (file)
--- a/package/swconfig/src/swlib.c
+++ b/package/swconfig/src/swlib.c
@@ -368,11 +368,26 @@ int swlib_set_attr_string(struct switch_dev *dev, struct switch_attr *a, int por
                ptr = (char *)str;
                while(ptr && *ptr)
                {
+                       while(*ptr && isspace(*ptr))
+                               ptr++;
+
+                       if (!*ptr)
+                               break;
+
+                       if (!isdigit(*ptr))
+                               return -1;
+
+                       if (val.len >= dev->ports)
+                               return -1;
+
                        ports[val.len].flags = 0;
                        ports[val.len].id = strtoul(ptr, &ptr, 10);
                        while(*ptr && !isspace(*ptr)) {
                                if (*ptr == 't')
                                        ports[val.len].flags |= SWLIB_PORT_FLAG_TAGGED;
+                               else
+                                       return -1;
+
                                ptr++;
                        }
                        if (*ptr)