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35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
From d157bd761585605b7882935ffb86286919f62ea1 Mon Sep 17 00:00:00 2001
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From: Florian Westphal <fw@strlen.de>
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Date: Thu, 10 Mar 2016 01:56:23 +0100
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Subject: netfilter: x_tables: check for size overflow
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Ben Hawkes says:
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integer overflow in xt_alloc_table_info, which on 32-bit systems can
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lead to small structure allocation and a copy_from_user based heap
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corruption.
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Reported-by: Ben Hawkes <hawkes@google.com>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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net/netfilter/x_tables.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
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index d0cd2b9..582c9cf 100644
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--- a/net/netfilter/x_tables.c
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+++ b/net/netfilter/x_tables.c
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@@ -659,6 +659,9 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
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struct xt_table_info *info = NULL;
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size_t sz = sizeof(*info) + size;
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+ if (sz < sizeof(*info))
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+ return NULL;
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+
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/* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
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if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > totalram_pages)
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return NULL;
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--
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cgit v1.1
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