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From cc70f19e588a0a33ed86c4a059b56a8f5b0c7a82 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Mon, 27 Jan 2020 16:11:41 +0100
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Subject: [PATCH] netlink: Fix leak in unterminated string deserializer
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1793030
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Upstream Status: nftables commit c3f6be3f2dced
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commit c3f6be3f2dcedf6d79751c0b975315ebc3184364
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Author: Phil Sutter <phil@nwl.cc>
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Date: Mon Jan 20 13:52:10 2020 +0100
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netlink: Fix leak in unterminated string deserializer
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Allocated 'mask' expression is not freed before returning to caller,
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although it is used temporarily only.
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Fixes: b851ba4731d9f ("src: add interface wildcard matching")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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src/netlink_delinearize.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
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index 154353b..06a0312 100644
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--- a/src/netlink_delinearize.c
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+++ b/src/netlink_delinearize.c
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@@ -2030,7 +2030,7 @@ static bool __expr_postprocess_string(struct expr **exprp)
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static struct expr *expr_postprocess_string(struct expr *expr)
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{
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- struct expr *mask;
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+ struct expr *mask, *out;
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assert(expr_basetype(expr)->type == TYPE_STRING);
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if (__expr_postprocess_string(&expr))
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@@ -2040,7 +2040,9 @@ static struct expr *expr_postprocess_string(struct expr *expr)
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BYTEORDER_HOST_ENDIAN,
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expr->len + BITS_PER_BYTE, NULL);
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mpz_init_bitmask(mask->value, expr->len);
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- return string_wildcard_expr_alloc(&expr->location, mask, expr);
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+ out = string_wildcard_expr_alloc(&expr->location, mask, expr);
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+ expr_free(mask);
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+ return out;
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}
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static void expr_postprocess(struct rule_pp_ctx *ctx, struct expr **exprp)
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--
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2.31.1
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