Fix OOB in BNEP_Write

Bug: 112050583
Test: PoC
Change-Id: I2ad3aceea38950b83f98819ede47538afb053ac0
(cherry picked from commit b31554e2)
CRs-Fixed: 3155069

stack/bnep/bnep_api.cc

@@ -349,10 +349,15 @@ tBNEP_RESULT BNEP_WriteBuf(uint16_t handle, const RawAddress& p_dest_addr,
   p_bcb = &(bnep_cb.bcb[handle - 1]);
   /* Check MTU size */
   if (p_buf->len > BNEP_MTU_SIZE) {
-    BNEP_TRACE_ERROR("BNEP_Write() length %d exceeded MTU %d", p_buf->len,
+    BNEP_TRACE_ERROR("%s length %d exceeded MTU %d", __func__, p_buf->len,
                      BNEP_MTU_SIZE);
     osi_free(p_buf);
     return (BNEP_MTU_EXCEDED);
+  } else if (p_buf->len < 2) {
+    BNEP_TRACE_ERROR("%s length %d too short, must be at least 2", __func__,
+                     p_buf->len);
+    osi_free(p_buf);
+    return BNEP_IGNORE_CMD;
   }
 
   /* Check if the packet should be filtered out */
@@ -449,9 +454,13 @@ tBNEP_RESULT BNEP_Write(uint16_t handle, const RawAddress& p_dest_addr,
 
   /* Check MTU size. Consider the possibility of having extension headers */
   if (len > BNEP_MTU_SIZE) {
-    BNEP_TRACE_ERROR("BNEP_Write() length %d exceeded MTU %d", len,
+    BNEP_TRACE_ERROR("%s length %d exceeded MTU %d", __func__, len,
                      BNEP_MTU_SIZE);
     return (BNEP_MTU_EXCEDED);
+  } else if (len < 2) {
+    BNEP_TRACE_ERROR("%s length %d too short, must be at least 2", __func__,
+                     len);
+    return BNEP_IGNORE_CMD;
   }
 
   if ((!handle) || (handle > BNEP_MAX_CONNECTIONS)) return (BNEP_WRONG_HANDLE);