From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CAB6415A49B; Fri, 29 Mar 2024 12:32:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711715533; cv=none; b=QFpN28WRXoi45U/73Anxnisop0N4MRPrw3oXin39fBwB4iYxU+wGXfKgif3TY/uGseJOpm07sBlwd+nOUXVpsbel2UlYVR8ckiCH0wtVXQY5cOkH2HmlWPJ53VTp7Dt18xlyOb01Z55VneDBnXv/FQeEbD+uAhx6Enan+gVu0GE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711715533; c=relaxed/simple; bh=S82mcnLoAgLHLLUc/tmsd7zTZGwm1HRCO6vTX9LS/lk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kC5nKv3T2XZ7gGsHVpEzwJ/tziDOinExaTO22FOB4e/QWLwd4BdNQKzGo+ImoewgBraK7Q7AaEeYZGE5cuBOH/qz8KpYFKulgJPMsNl1qymlWJRFviy3y3B2Ru6qZau3BDWjFindn5ERfc/9DUeXEGs11gfieyUWkazH2kkhRN8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KO+xz6iG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="KO+xz6iG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD6C2C43390; Fri, 29 Mar 2024 12:32:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711715533; bh=S82mcnLoAgLHLLUc/tmsd7zTZGwm1HRCO6vTX9LS/lk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KO+xz6iGzGYExW+tc6fK9ZjqI2Til+gK25fmCjCK4mIVUX0N+Y9Oi6HJPOpCMRUgm Q+RQ2eOhzLyGeaOhd5aa7HpPh+DHpLOPp9TsmrZ9PP6cJsc3tbOJLRwwy+RCixZapm 06226FlibBUvBXMf/0yHaZ0z7Jv0KfBW+ipVRJ9+1VdcjjpT8iY30FCgrKctx5E0aj u2rouCRFNly7ypEWAE2zv2jqJkJORozsir9L5y6Q3eG0OpTkytvMUi4djBr0fXQaBO 8Q6NQPfnWHve8N2Kc84i3+JzjOkxcqY3Etz2Aa2+bafhcHgvejs0EtzgORc2A+omyr 4HCUr9KRNwj1g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Markus Elfring , Sven Eckelmann , Simon Wunderlich , Sasha Levin , mareklindner@neomailbox.ch, a@unstable.cc, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, b.a.t.m.a.n@lists.open-mesh.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 04/31] batman-adv: Improve exception handling in batadv_throw_uevent() Date: Fri, 29 Mar 2024 08:31:23 -0400 Message-ID: <20240329123207.3085013-4-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240329123207.3085013-1-sashal@kernel.org> References: <20240329123207.3085013-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.83 Content-Transfer-Encoding: 8bit From: Markus Elfring [ Upstream commit 5593e9abf1cf2bf096366d8c7fd933bc69d561ce ] The kfree() function was called in up to three cases by the batadv_throw_uevent() function during error handling even if the passed variable contained a null pointer. This issue was detected by using the Coccinelle software. * Thus adjust jump targets. * Reorder kfree() calls at the end. Signed-off-by: Markus Elfring Acked-by: Sven Eckelmann Signed-off-by: Simon Wunderlich Signed-off-by: Sasha Levin --- net/batman-adv/main.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index e8a4499155667..100e43f5e85aa 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -688,29 +688,31 @@ int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, "%s%s", BATADV_UEV_TYPE_VAR, batadv_uev_type_str[type]); if (!uevent_env[0]) - goto out; + goto report_error; uevent_env[1] = kasprintf(GFP_ATOMIC, "%s%s", BATADV_UEV_ACTION_VAR, batadv_uev_action_str[action]); if (!uevent_env[1]) - goto out; + goto free_first_env; /* If the event is DEL, ignore the data field */ if (action != BATADV_UEV_DEL) { uevent_env[2] = kasprintf(GFP_ATOMIC, "%s%s", BATADV_UEV_DATA_VAR, data); if (!uevent_env[2]) - goto out; + goto free_second_env; } ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); -out: - kfree(uevent_env[0]); - kfree(uevent_env[1]); kfree(uevent_env[2]); +free_second_env: + kfree(uevent_env[1]); +free_first_env: + kfree(uevent_env[0]); if (ret) +report_error: batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", batadv_uev_type_str[type], -- 2.43.0