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Date: Tue, 28 Jan 2020 15:04:59 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>, Jukka Rissanen <jukka.rissanen@...ux.intel.com>, Alexander Aring <aring@...atatu.com>, Marcel Holtmann <marcel@...tmann.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.4 080/183] 6lowpan: Off by one handling ->nexthdr From: Dan Carpenter <dan.carpenter@...cle.com> [ Upstream commit f57c4bbf34439531adccd7d3a4ecc14f409c1399 ] NEXTHDR_MAX is 255. What happens here is that we take a u8 value "hdr->nexthdr" from the network and then look it up in lowpan_nexthdr_nhcs[]. The problem is that if hdr->nexthdr is 0xff then we read one element beyond the end of the array so the array needs to be one element larger. Fixes: 92aa7c65d295 ("6lowpan: add generic nhc layer interface") Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com> Acked-by: Jukka Rissanen <jukka.rissanen@...ux.intel.com> Acked-by: Alexander Aring <aring@...atatu.com> Signed-off-by: Marcel Holtmann <marcel@...tmann.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- net/6lowpan/nhc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/6lowpan/nhc.c b/net/6lowpan/nhc.c index 7008d53e455c5..e61679bf09085 100644 --- a/net/6lowpan/nhc.c +++ b/net/6lowpan/nhc.c @@ -18,7 +18,7 @@ #include "nhc.h" static struct rb_root rb_root = RB_ROOT; -static struct lowpan_nhc *lowpan_nexthdr_nhcs[NEXTHDR_MAX]; +static struct lowpan_nhc *lowpan_nexthdr_nhcs[NEXTHDR_MAX + 1]; static DEFINE_SPINLOCK(lowpan_nhc_lock); static int lowpan_nhc_insert(struct lowpan_nhc *nhc) -- 2.20.1
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