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From 55c537734f476d04c18f67083642b96bbead6219 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Mon, 27 Jan 2020 16:11:41 +0100
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Subject: [PATCH] netlink: Avoid potential NULL-pointer deref in
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netlink_gen_payload_stmt()
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1793030
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Upstream Status: nftables commit c9ddf0bff363f
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commit c9ddf0bff363fc9101b563b592db600bdf4d65c5
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Author: Phil Sutter <phil@nwl.cc>
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Date: Mon Jan 20 16:32:40 2020 +0100
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netlink: Avoid potential NULL-pointer deref in netlink_gen_payload_stmt()
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With payload_needs_l4csum_update_pseudohdr() unconditionally
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dereferencing passed 'desc' parameter and a previous check for it to be
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non-NULL, make sure to call the function only if input is sane.
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Fixes: 68de70f2b3fc6 ("netlink_linearize: fix IPv6 layer 4 checksum mangling")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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src/netlink_linearize.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/netlink_linearize.c b/src/netlink_linearize.c
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index 498326d..cb1b7fe 100644
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--- a/src/netlink_linearize.c
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+++ b/src/netlink_linearize.c
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@@ -941,7 +941,7 @@ static void netlink_gen_payload_stmt(struct netlink_linearize_ctx *ctx,
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nftnl_expr_set_u32(nle, NFTNL_EXPR_PAYLOAD_CSUM_OFFSET,
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csum_off / BITS_PER_BYTE);
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}
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- if (expr->payload.base == PROTO_BASE_NETWORK_HDR &&
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+ if (expr->payload.base == PROTO_BASE_NETWORK_HDR && desc &&
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payload_needs_l4csum_update_pseudohdr(expr, desc))
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nftnl_expr_set_u32(nle, NFTNL_EXPR_PAYLOAD_FLAGS,
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NFT_PAYLOAD_L4CSUM_PSEUDOHDR);
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--
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8ff5ad |
2.31.1
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