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From 76a8ca39b3f95b898cd92546fb87ccaa2d1922c7 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Wed, 20 Jun 2018 09:22:47 +0200
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Subject: [PATCH] hash: Fix potential null-pointer dereference in
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hash_expr_cmp()
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1504157
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Upstream Status: nftables commit 5043a1e4847c0
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commit 5043a1e4847c0149dabaf0b529a14a43b957e5e4
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Author: Phil Sutter <phil@nwl.cc>
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Date: Thu Mar 1 15:00:30 2018 +0100
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hash: Fix potential null-pointer dereference in hash_expr_cmp()
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The first part of the conditional:
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| (e1->hash.expr || expr_cmp(e1->hash.expr, e2->hash.expr))
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will call expr_cmp() in case e1->hash.expr is NULL, causing null-pointer
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dereference. This is probably a typo, the intention when introducing
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this was to avoid the call to expr_cmp() for symmetric hash expressions
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which don't use expr->hash.expr. Inverting the existence check should
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fix this.
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Fixes: 3a86406729782 ("src: hash: support of symmetric hash")
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Cc: Laura Garcia Liebana <nevola@gmail.com>
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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src/hash.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/hash.c b/src/hash.c
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index 3355cad..e699963 100644
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--- a/src/hash.c
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+++ b/src/hash.c
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@@ -36,7 +36,7 @@ static void hash_expr_print(const struct expr *expr, struct output_ctx *octx)
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static bool hash_expr_cmp(const struct expr *e1, const struct expr *e2)
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{
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- return (e1->hash.expr ||
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+ return (!e1->hash.expr ||
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expr_cmp(e1->hash.expr, e2->hash.expr)) &&
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e1->hash.mod == e2->hash.mod &&
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e1->hash.seed_set == e2->hash.seed_set &&
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--
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1.8.3.1
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