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From e155035446b39f6cda9c74c079e0b71cc408bb0b Mon Sep 17 00:00:00 2001
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From: Liping Zhang <zlpnobody@gmail.com>
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Date: Sun, 19 Mar 2017 22:01:10 +0800
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Subject: [PATCH] examples: fix double free in nftc-helper-add
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After inputting the following test command, core dump happened:
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# ./examples/nfct-helper-add test 1
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*** Error in
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`.../libnetfilter_cthelper/examples/.libs/lt-nfct-helper-add':
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double free or corruption (fasttop): 0x0000000001f3c070 ***
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======= Backtrace: =========
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/lib64/libc.so.6(+0x77de5)[0x7fd9ebe88de5]
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/lib64/libc.so.6(+0x8022a)[0x7fd9ebe9122a]
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/lib64/libc.so.6(cfree+0x4c)[0x7fd9ebe9478c]
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[...]
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Because "struct nfct_helper_policy *p" had been freed by nfct_helper_free,
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so there's no need to invoke nfct_helper_policy_free again, otherwise
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double free error will happen.
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Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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(cherry picked from commit 9f223e612d3b0be6e4dca84e1db8042dbec64e93)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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examples/nfct-helper-add.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/examples/nfct-helper-add.c b/examples/nfct-helper-add.c
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index 6c476261b75e8..cb7291e8ec4b0 100644
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--- a/examples/nfct-helper-add.c
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+++ b/examples/nfct-helper-add.c
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@@ -32,6 +32,7 @@ int main(int argc, char *argv[])
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nfct_helper_attr_set_u16(nfct_helper, NFCTH_ATTR_PROTO_L3NUM, AF_INET);
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nfct_helper_attr_set_u8(nfct_helper, NFCTH_ATTR_PROTO_L4NUM, IPPROTO_TCP);
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+ /* Will be freed by nfct_helper_free. */
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p = nfct_helper_policy_alloc();
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if (p == NULL) {
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perror("OOM");
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@@ -49,7 +50,6 @@ int main(int argc, char *argv[])
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nfct_helper_nlmsg_build_payload(nlh, nfct_helper);
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nfct_helper_free(nfct_helper);
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- nfct_helper_policy_free(p);
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nl = mnl_socket_open(NETLINK_NETFILTER);
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if (nl == NULL) {
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--
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2.23.0
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