Revert "buffer: Create ssh_buffer_validate_length()"

This reverts commit 34bdc1ca7871e8e9258077411edd516c8de55299.

2 files changed, 3 insertions, 23 deletions

diff --git a/include/libssh/buffer.h b/include/libssh/buffer.h
index 81d9452b..d4cb071b 100644
--- a/include/libssh/buffer.h
+++ b/include/libssh/buffer.h
@@ -48,8 +48,6 @@ int ssh_buffer_add_u16(ssh_buffer buffer, uint16_t data);
 int ssh_buffer_add_u32(ssh_buffer buffer, uint32_t data);
 int ssh_buffer_add_u64(ssh_buffer buffer, uint64_t data);
 
-int ssh_buffer_validate_length(struct ssh_buffer_struct *buffer, size_t len);
-
 int ssh_buffer_pack_va(struct ssh_buffer_struct *buffer,
                        const char *format,
                        int argc,
diff --git a/src/buffer.c b/src/buffer.c
index 0c776698..61b07e9a 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -526,8 +526,8 @@ uint32_t ssh_buffer_get_data(struct ssh_buffer_struct *buffer, void *data, uint3
      * Check for a integer overflow first, then check if not enough data is in
      * the buffer.
      */
-    if (!ssh_buffer_validate_length(buffer, len)) {
-        return 0;
+    if (buffer->pos + len < len || buffer->pos + len > buffer->used) {
+      return 0;
     }
     memcpy(data,buffer->data+buffer->pos,len);
     buffer->pos+=len;
@@ -581,24 +581,6 @@ int ssh_buffer_get_u64(struct ssh_buffer_struct *buffer, uint64_t *data){
 }
 
 /**
- * @brief Valdiates that the given length can be obtained from the buffer.
- *
- * @param[in]  buffer  The buffer to read from.
- *
- * @param[in]  len     The length to be checked.
- *
- * @return             SSH_OK if the length is valid, SSH_ERROR otherwise.
- */
-int ssh_buffer_validate_length(struct ssh_buffer_struct *buffer, size_t len)
-{
-    if (buffer->pos + len < len || buffer->pos + len > buffer->used) {
-        return SSH_ERROR;
-    }
-
-    return SSH_OK;
-}
-
-/**
  * @internal
  *
  * @brief Get a SSH String out of the buffer and adjusts the read pointer.
@@ -617,7 +599,7 @@ struct ssh_string_struct *ssh_buffer_get_ssh_string(struct ssh_buffer_struct *bu
   }
   hostlen = ntohl(stringlen);
   /* verify if there is enough space in buffer to get it */
-  if (!ssh_buffer_validate_length(buffer, hostlen) {
+  if (buffer->pos + hostlen < hostlen || buffer->pos + hostlen > buffer->used) {
     return NULL; /* it is indeed */
   }
   str = ssh_string_new(hostlen);