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netlink_parse_set_expr() creates a dummy rule object to reuse the
existing netlink parser. Release the rule object to fix a memleak.
Zap the statement list to avoid a use-after-free since the statement
needs to remain in place after releasing the rule.
==21601==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 2016 byte(s) in 4 object(s) allocated from:
#0 0x7f7824b26330 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xe9330)
#1 0x7f78245fcebd in xmalloc /home/pablo/devel/scm/git-netfilter/nftables/src/utils.c:36
#2 0x7f78245fd016 in xzalloc /home/pablo/devel/scm/git-netfilter/nftables/src/utils.c:65
#3 0x7f782456f0b5 in rule_alloc /home/pablo/devel/scm/git-netfilter/nftables/src/rule.c:623
Add a test to check for set counters.
SUMMARY: AddressSanitizer: 2016 byte(s) leaked in 4 allocation(s).
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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