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From 05407602f79391e89e57ef5c4a1a0aea720855e2 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Tue, 21 Feb 2023 19:50:41 +0100
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Subject: [PATCH] netlink_delinearize: Sanitize concat data element decoding
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2160049
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Upstream Status: nftables commit 1344d9e53ba4d
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commit 1344d9e53ba4d67cedd13a2c76a970fc7ce65683
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Author: Phil Sutter <phil@nwl.cc>
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Date: Tue Feb 21 18:36:01 2023 +0100
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netlink_delinearize: Sanitize concat data element decoding
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The call to netlink_get_register() might return NULL, catch this before
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dereferencing the pointer.
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Fixes: db59a5c1204c9 ("netlink_delinearize: fix decoding of concat data element")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Acked-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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src/netlink_delinearize.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
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index e9e0845..cadb8ec 100644
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--- a/src/netlink_delinearize.c
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+++ b/src/netlink_delinearize.c
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@@ -1660,7 +1660,7 @@ static void netlink_parse_dynset(struct netlink_parse_ctx *ctx,
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sreg_data = netlink_parse_register(nle, NFTNL_EXPR_DYNSET_SREG_DATA);
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expr_data = netlink_get_register(ctx, loc, sreg_data);
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- if (expr_data->len < set->data->len) {
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+ if (expr_data && expr_data->len < set->data->len) {
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expr_free(expr_data);
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expr_data = netlink_parse_concat_expr(ctx, loc, sreg_data, set->data->len);
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if (expr_data == NULL)
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--
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2.39.2
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