From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Markus Elfring <elfring@users.sourceforge.net>,
Sven Eckelmann <sven@narfation.org>,
Simon Wunderlich <sw@simonwunderlich.de>,
Sasha Levin <sashal@kernel.org>,
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 5.4 03/15] batman-adv: Improve exception handling in batadv_throw_uevent()
Date: Fri, 29 Mar 2024 08:34:26 -0400 [thread overview]
Message-ID: <20240329123445.3086536-3-sashal@kernel.org> (raw)
In-Reply-To: <20240329123445.3086536-1-sashal@kernel.org>
From: Markus Elfring <elfring@users.sourceforge.net>
[ 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 <elfring@users.sourceforge.net>
Acked-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 6a183c94cdeb4..62425d19bd598 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -733,29 +733,31 @@ 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
prev parent reply other threads:[~2024-03-29 12:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240329123445.3086536-1-sashal@kernel.org>
2024-03-29 12:34 ` [PATCH AUTOSEL 5.4 02/15] batman-adv: Return directly after a failed batadv_dat_select_candidates() in batadv_dat_forward_data() Sasha Levin
2024-03-29 12:34 ` Sasha Levin [this message]
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