From 6d2bc4f144f5d0ee90c61e21c3cb54690637b8f9 Mon Sep 17 00:00:00 2001 From: Arto Kinnunen Date: Tue, 18 Feb 2020 14:40:58 +0200 Subject: [PATCH] Update STM32 EMAC driver - limit RX frame length DISCO_F769NI EMAC driver may return ethernet packet with illegal length when driver is under heavy load. In one case, the received bytes indicate frame length of 53 bytes but advertised data length was 65518 bytes. In another case EMAC driver variable `EthHandle.RxFrameInfos.length` contained value 0xFFFF FFFC. As a work-around accept only 1-1500 bytes long ethernet packets. --- features/netsocket/emac-drivers/TARGET_STM/stm32xx_emac.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) mode change 100644 => 100755 features/netsocket/emac-drivers/TARGET_STM/stm32xx_emac.cpp diff --git a/features/netsocket/emac-drivers/TARGET_STM/stm32xx_emac.cpp b/features/netsocket/emac-drivers/TARGET_STM/stm32xx_emac.cpp old mode 100644 new mode 100755 index a13e4d124c..55f82b16cb --- a/features/netsocket/emac-drivers/TARGET_STM/stm32xx_emac.cpp +++ b/features/netsocket/emac-drivers/TARGET_STM/stm32xx_emac.cpp @@ -546,7 +546,7 @@ int STM32_EMAC::low_level_input(emac_mem_buf_t **buf) dmarxdesc = EthHandle.RxFrameInfos.FSRxDesc; - if (len > 0) { + if (len > 0 && EthHandle.RxFrameInfos.length <= 1500) { /* Allocate a memory buffer chain from buffer pool */ *buf = memory_manager->alloc_pool(len, 0); }