linux-kernel - [PATCH 4.9 221/240] kobject_uevent: remove warning in init_uevent

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Message-Id: <20210520092116.120588012@linuxfoundation.org>
Date:   Thu, 20 May 2021 11:23:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        syzbot+92340f7b2b4789907fdb@...kaller.appspotmail.com
Subject: [PATCH 4.9 221/240] kobject_uevent: remove warning in init_uevent_argv()

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit b4104180a2efb85f55e1ba1407885c9421970338 upstream.

syzbot can trigger the WARN() in init_uevent_argv() which isn't the
nicest as the code does properly recover and handle the error.  So
change the WARN() call to pr_warn() and provide some more information on
what the buffer size that was needed.

Link: https://lore.kernel.org/r/20201107082206.GA19079@kroah.com
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: linux-kernel@...r.kernel.org
Reported-by: syzbot+92340f7b2b4789907fdb@...kaller.appspotmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Link: https://lore.kernel.org/r/20210405094852.1348499-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 lib/kobject_uevent.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -128,12 +128,13 @@ static int kobj_usermode_filter(struct k
 
 static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem)
 {
+	int buffer_size = sizeof(env->buf) - env->buflen;
 	int len;
 
-	len = strlcpy(&env->buf[env->buflen], subsystem,
-		      sizeof(env->buf) - env->buflen);
-	if (len >= (sizeof(env->buf) - env->buflen)) {
-		WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n");
+	len = strlcpy(&env->buf[env->buflen], subsystem, buffer_size);
+	if (len >= buffer_size) {
+		pr_warn("init_uevent_argv: buffer size of %d too small, needed %d\n",
+			buffer_size, len);
 		return -ENOMEM;
 	}