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From a79e92c0f6761a748ef3cbffd26a4f1db82b4b3e Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Fri, 11 Jun 2021 16:07:02 +0200
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Subject: [PATCH] parser_json: Fix for memleak in tcp option error path
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If 'kind' value is invalid, the function returned without freeing 'expr'
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first. Fix this by performing the check before allocation.
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Fixes: cb21869649208 ("json: tcp: add raw tcp option match support")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit f7b0eef8391ae7f89a3a82f6eeecaebe199224d7)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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src/parser_json.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/src/parser_json.c b/src/parser_json.c
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index f0486b77a225a..85d05ce27eef3 100644
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--- a/src/parser_json.c
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+++ b/src/parser_json.c
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@@ -611,12 +611,12 @@ static struct expr *json_parse_tcp_option_expr(struct json_ctx *ctx,
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"base", &kind, "offset", &offset, "len", &len)) {
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uint32_t flag = 0;
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- expr = tcpopt_expr_alloc(int_loc, kind,
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- TCPOPT_COMMON_KIND);
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-
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if (kind < 0 || kind > 255)
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return NULL;
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+ expr = tcpopt_expr_alloc(int_loc, kind,
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+ TCPOPT_COMMON_KIND);
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+
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if (offset == TCPOPT_COMMON_KIND && len == 8)
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flag = NFT_EXTHDR_F_PRESENT;
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--
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2.31.1
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