[BLOBMSG_TYPE_UNSPEC] = BLOB_ATTR_BINARY,
};
-static uint16_t
-blobmsg_namelen(const struct blobmsg_hdr *hdr)
+bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
{
- return be16_to_cpu(hdr->namelen);
+ return blobmsg_check_attr_len(attr, name, blob_raw_len(attr));
}
-bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
+static const struct blobmsg_hdr* blobmsg_hdr_from_blob(const struct blob_attr *attr, size_t len)
+{
+ if (len < sizeof(struct blob_attr) + sizeof(struct blobmsg_hdr))
+ return NULL;
+
+ return blob_data(attr);
+}
+
+static bool blobmsg_hdr_valid_namelen(const struct blobmsg_hdr *hdr, size_t len)
+{
+ if (len < sizeof(struct blob_attr) + sizeof(struct blobmsg_hdr) + blobmsg_namelen(hdr) + 1)
+ return false;
+
+ return true;
+}
+
+static bool blobmsg_check_name(const struct blob_attr *attr, size_t len, bool name)
{
+ char *limit = (char *) attr + len;
const struct blobmsg_hdr *hdr;
- const char *data;
- int id, len;
- if (blob_len(attr) < sizeof(struct blobmsg_hdr))
+ hdr = blobmsg_hdr_from_blob(attr, len);
+ if (!hdr)
+ return false;
+
+ if (name && !hdr->namelen)
return false;
- hdr = (void *) attr->data;
- if (!hdr->namelen && name)
+ if (name && !blobmsg_hdr_valid_namelen(hdr, len))
return false;
- if (blobmsg_namelen(hdr) > blob_len(attr) - sizeof(struct blobmsg_hdr))
+ if ((char *) hdr->name + blobmsg_namelen(hdr) + 1 > limit)
+ return false;
+
+ if (blobmsg_namelen(hdr) > (blob_len(attr) - sizeof(struct blobmsg_hdr)))
return false;
if (hdr->name[blobmsg_namelen(hdr)] != 0)
return false;
- id = blob_id(attr);
- len = blobmsg_data_len(attr);
+ return true;
+}
+
+static const char* blobmsg_check_data(const struct blob_attr *attr, size_t len, size_t *data_len)
+{
+ char *limit = (char *) attr + len;
+ const char *data;
+
+ *data_len = blobmsg_data_len(attr);
+ if (*data_len > blob_raw_len(attr))
+ return NULL;
+
data = blobmsg_data(attr);
+ if (data + *data_len > limit)
+ return NULL;
+
+ return data;
+}
+
+bool blobmsg_check_attr_len(const struct blob_attr *attr, bool name, size_t len)
+{
+ const char *data;
+ size_t data_len;
+ int id;
+ if (!blobmsg_check_name(attr, len, name))
+ return false;
+
+ id = blob_id(attr);
if (id > BLOBMSG_TYPE_LAST)
return false;
if (!blob_type[id])
return true;
- return blob_check_type(data, len, blob_type[id]);
+ data = blobmsg_check_data(attr, len, &data_len);
+ if (!data)
+ return false;
+
+ return blob_check_type(data, data_len, blob_type[id]);
}
int blobmsg_check_array(const struct blob_attr *attr, int type)
+{
+ return blobmsg_check_array_len(attr, type, blob_len(attr));
+}
+
+int blobmsg_check_array_len(const struct blob_attr *attr, int type, size_t len)
{
struct blob_attr *cur;
bool name;
- int rem;
int size = 0;
+ if (type > BLOBMSG_TYPE_LAST)
+ return -1;
+
+ if (!blobmsg_check_attr_len(attr, false, len))
+ return -1;
+
switch (blobmsg_type(attr)) {
case BLOBMSG_TYPE_TABLE:
name = true;
return -1;
}
- blobmsg_for_each_attr(cur, attr, rem) {
+ __blobmsg_for_each_attr(cur, attr, len) {
if (type != BLOBMSG_TYPE_UNSPEC && blobmsg_type(cur) != type)
return -1;
- if (!blobmsg_check_attr(cur, name))
+ if (!blobmsg_check_attr_len(cur, name, len))
return -1;
size++;
return blobmsg_check_array(attr, type) >= 0;
}
+bool blobmsg_check_attr_list_len(const struct blob_attr *attr, int type, size_t len)
+{
+ return blobmsg_check_array_len(attr, type, len) >= 0;
+}
+
int blobmsg_parse_array(const struct blobmsg_policy *policy, int policy_len,
struct blob_attr **tb, void *data, unsigned int len)
{
blob_id(attr) != policy[i].type)
continue;
- if (!blobmsg_check_attr(attr, false))
+ if (!blobmsg_check_attr_len(attr, false, len))
return -1;
if (tb[i])
return 0;
}
-
int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
struct blob_attr **tb, void *data, unsigned int len)
{
- struct blobmsg_hdr *hdr;
+ const struct blobmsg_hdr *hdr;
struct blob_attr *attr;
uint8_t *pslen;
int i;
}
__blob_for_each_attr(attr, data, len) {
- hdr = blob_data(attr);
+ hdr = blobmsg_hdr_from_blob(attr, len);
+ if (!hdr)
+ return -1;
+
+ if (!blobmsg_hdr_valid_namelen(hdr, len))
+ return -1;
+
for (i = 0; i < policy_len; i++) {
if (!policy[i].name)
continue;
if (blobmsg_namelen(hdr) != pslen[i])
continue;
- if (!blobmsg_check_attr(attr, true))
+ if (!blobmsg_check_attr_len(attr, true, len))
return -1;
if (tb[i])
attr->id_len |= be32_to_cpu(BLOB_ATTR_EXTENDED);
hdr = blob_data(attr);
hdr->namelen = cpu_to_be16(namelen);
- strcpy((char *) hdr->name, (const char *)name);
+
+ memcpy(hdr->name, name, namelen);
+ hdr->name[namelen] = '\0';
+
pad_end = *data = blobmsg_data(attr);
pad_start = (char *) &hdr->name[namelen];
if (pad_start < pad_end)
return (void *)offset;
}
-int
-blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg)
+__attribute__((format(printf, 3, 0)))
+int blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg)
{
va_list arg2;
char cbuf;
len = vsnprintf(&cbuf, sizeof(cbuf), format, arg2);
va_end(arg2);
+ if (len < 0)
+ return -1;
+
sbuf = blobmsg_alloc_string_buffer(buf, name, len + 1);
if (!sbuf)
return -1;
- ret = vsprintf(sbuf, format, arg);
+
+ ret = vsnprintf(sbuf, len + 1, format, arg);
+ if (ret < 0)
+ return -1;
+
blobmsg_add_string_buffer(buf);
return ret;
}
-int
-blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...)
+__attribute__((format(printf, 3, 4)))
+int blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...)
{
va_list ap;
int ret;
projects / project / libubox.git / blobdiff