From e80d4ff2cc5f8f864e9e996c72b47ebefd2a5175 Mon Sep 17 00:00:00 2001 From: Erik Ekman Date: Fri, 19 Jun 2020 15:00:25 +0200 Subject: [PATCH] tcp: Fix double free in tcp_split_unsent_seg() Fixes bug #57377 (found by Hiromasa Ito). --- src/core/tcp_out.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c index bfb033b1..d9d1b57b 100644 --- a/src/core/tcp_out.c +++ b/src/core/tcp_out.c @@ -913,6 +913,7 @@ tcp_split_unsent_seg(struct tcp_pcb *pcb, u16_t split) seg = tcp_create_segment(pcb, p, remainder_flags, lwip_ntohl(useg->tcphdr->seqno) + split, optflags); if (seg == NULL) { + p = NULL; /* Freed by tcp_create_segment */ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("tcp_split_unsent_seg: could not create new TCP segment\n")); goto memerr;