From: Fillod Stephane <stephane.fillod@grassvalley.com>
Date: Fri, 11 Jun 2010 17:26:43 +0000 (+0200)
Subject: ip/defrag: fix processing of last short fragment
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e397e59e861aa818cda12a23206dde06f7e9f660;p=project%2Fbcm63xx%2Fu-boot.git

ip/defrag: fix processing of last short fragment

TFTP'ing a file of size 1747851 bytes with CONFIG_IP_DEFRAG and
CONFIG_TFTP_BLOCKSIZE set to 4096 fails with a timeout, because
the last fragment is not taken into account. This patch fixes
IP fragments having less than 8 bytes of payload.

Signed-off-by: Stephane Fillod <stephane.fillod@grassvalley.com>
Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
---

diff --git a/net/net.c b/net/net.c
index cda731986b..33fcd90cd4 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1201,7 +1201,8 @@ static IP_t *__NetDefragment(IP_t *ip, int *lenp)
 		h = payload + h->next_hole;
 	}
 
-	if (offset8 + (len / 8) <= h - payload) {
+	/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
+	if (offset8 + ((len + 7) / 8) <= h - payload) {
 		/* no overlap with holes (dup fragment?) */
 		return NULL;
 	}