44 lines
1.6 KiB
Diff
44 lines
1.6 KiB
Diff
From ee73e9dcd46dc5a1fe3be7caa8b9323819e394b8 Mon Sep 17 00:00:00 2001
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From: Florian Westphal <fw@strlen.de>
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Date: Tue, 5 Dec 2023 13:08:17 +0100
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Subject: [PATCH] evaluate: fix double free on dtype release
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We release ->dtype twice, will either segfault or assert
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on dtype->refcount != 0 check in datatype_free().
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Signed-off-by: Florian Westphal <fw@strlen.de>
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---
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src/evaluate.c | 2 +-
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.../bogons/nft-f/double-free-on-binop-dtype_assert | 6 ++++++
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2 files changed, 7 insertions(+), 1 deletion(-)
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create mode 100644 tests/shell/testcases/bogons/nft-f/double-free-on-binop-dtype_assert
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diff --git a/src/evaluate.c b/src/evaluate.c
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index 16ad6473..58cc811a 100644
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--- a/src/evaluate.c
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+++ b/src/evaluate.c
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@@ -1171,7 +1171,7 @@ static int expr_evaluate_prefix(struct eval_ctx *ctx, struct expr **expr)
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base = prefix->prefix;
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assert(expr_is_constant(base));
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- prefix->dtype = base->dtype;
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+ prefix->dtype = datatype_get(base->dtype);
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prefix->byteorder = base->byteorder;
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prefix->len = base->len;
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prefix->flags |= EXPR_F_CONSTANT;
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diff --git a/tests/shell/testcases/bogons/nft-f/double-free-on-binop-dtype_assert b/tests/shell/testcases/bogons/nft-f/double-free-on-binop-dtype_assert
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new file mode 100644
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index 00000000..b7a9a1cc
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--- /dev/null
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+++ b/tests/shell/testcases/bogons/nft-f/double-free-on-binop-dtype_assert
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@@ -0,0 +1,6 @@
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+table inet t {
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+ chain c {
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+ udp length . @th,160,118 vmap { 47-63 . 0xe3731353631303331313037353532/3 : accept }
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+ jump noexist # only here so this fails to load after patch.
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+ }
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+}
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--
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2.33.0
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