From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66026C61D97 for ; Wed, 22 Nov 2023 15:36:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344485AbjKVPgW (ORCPT ); Wed, 22 Nov 2023 10:36:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344532AbjKVPfo (ORCPT ); Wed, 22 Nov 2023 10:35:44 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F3741984; Wed, 22 Nov 2023 07:34:41 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C62B8C433C9; Wed, 22 Nov 2023 15:34:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700667254; bh=cpaY/yV5WXyg9YEkeW49vlb9lDNYl17fwLO5WtfKdaE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Yqhg+GPr5JeiBnmMSTPm9JeYt9D4jFSrMHbIHGzBYL3Q2WZvQOXlKGREx77G7f6Cc IeWtCvfcrqDpj04KIGdBROE9gPp5Y3riqX61+Z1uNh4lPs5dALDq2Yz2uuZvNRUjqR KNyN/PFxM2UERigRqodO4ju5JiQM93GqxMCZisplvyWEXiSpsY0VWW9sRK2+Mt9bNs nFRCNhzfsdWjEh18kTFRCHrZLMKD9Q10pH421Dq/028K7afyiTcMDcF+YKqANjBYTc oui5dAG+j6Pp+/qw6Bue4kHlY9tOMFKeCWYiDOLlKF1bDmJ+b4mINXAGjJmYiV9Com GZgMFfTHsbgxA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Masahiro Yamada , Sasha Levin , linux-kbuild@vger.kernel.org Subject: [PATCH AUTOSEL 6.5 11/15] kconfig: fix memory leak from range properties Date: Wed, 22 Nov 2023 10:33:13 -0500 Message-ID: <20231122153340.852434-11-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231122153340.852434-1-sashal@kernel.org> References: <20231122153340.852434-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.5.12 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masahiro Yamada [ Upstream commit ae1eff0349f2e908fc083630e8441ea6dc434dc0 ] Currently, sym_validate_range() duplicates the range string using xstrdup(), which is overwritten by a subsequent sym_calc_value() call. It results in a memory leak. Instead, only the pointer should be copied. Below is a test case, with a summary from Valgrind. [Test Kconfig] config FOO int "foo" range 10 20 [Test .config] CONFIG_FOO=0 [Before] LEAK SUMMARY: definitely lost: 3 bytes in 1 blocks indirectly lost: 0 bytes in 0 blocks possibly lost: 0 bytes in 0 blocks still reachable: 17,465 bytes in 21 blocks suppressed: 0 bytes in 0 blocks [After] LEAK SUMMARY: definitely lost: 0 bytes in 0 blocks indirectly lost: 0 bytes in 0 blocks possibly lost: 0 bytes in 0 blocks still reachable: 17,462 bytes in 20 blocks suppressed: 0 bytes in 0 blocks Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- scripts/kconfig/symbol.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c index 0572330bf8a78..a76925b46ce63 100644 --- a/scripts/kconfig/symbol.c +++ b/scripts/kconfig/symbol.c @@ -122,9 +122,9 @@ static long long sym_get_range_val(struct symbol *sym, int base) static void sym_validate_range(struct symbol *sym) { struct property *prop; + struct symbol *range_sym; int base; long long val, val2; - char str[64]; switch (sym->type) { case S_INT: @@ -140,17 +140,15 @@ static void sym_validate_range(struct symbol *sym) if (!prop) return; val = strtoll(sym->curr.val, NULL, base); - val2 = sym_get_range_val(prop->expr->left.sym, base); + range_sym = prop->expr->left.sym; + val2 = sym_get_range_val(range_sym, base); if (val >= val2) { - val2 = sym_get_range_val(prop->expr->right.sym, base); + range_sym = prop->expr->right.sym; + val2 = sym_get_range_val(range_sym, base); if (val <= val2) return; } - if (sym->type == S_INT) - sprintf(str, "%lld", val2); - else - sprintf(str, "0x%llx", val2); - sym->curr.val = xstrdup(str); + sym->curr.val = range_sym->curr.val; } static void sym_set_changed(struct symbol *sym) -- 2.42.0