From 77e867b5f133f6bb3debcfcc75ce4536d644e62e Mon Sep 17 00:00:00 2001 From: Lukasz Duda Date: Mon, 10 Aug 2015 21:15:52 +0200 Subject: [PATCH] 6lowpan: Fix extraction of flow label field The lowpan_fetch_skb function is used to fetch the first byte, which also increments the data pointer in skb structure, making subsequent array lookup of byte 0 actually being byte 1. To decompress the first byte of the Flow Label when the TF flag is set to 0x01, the second half of the first byte is needed. The patch fixes the extraction of the Flow Label field. Acked-by: Jukka Rissanen Signed-off-by: Lukasz Duda Signed-off-by: Glenn Ruben Bakke Signed-off-by: Alexander Aring Signed-off-by: Marcel Holtmann --- net/6lowpan/iphc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c index 9055d7b9d112..74e56d7449c8 100644 --- a/net/6lowpan/iphc.c +++ b/net/6lowpan/iphc.c @@ -284,7 +284,7 @@ lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev, if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) return -EINVAL; - hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); + hdr.flow_lbl[0] = (tmp & 0x0F) | ((tmp >> 2) & 0x30); memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); skb_pull(skb, 2); break; -- 2.30.2