linux-kernel - [PATCH 5.4 80/87] Bluetooth: Fix bt_skb_sendmmsg not allocating partial chunks

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Message-Id: <20220727161012.318635744@linuxfoundation.org>
Date:   Wed, 27 Jul 2022 18:11:13 +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, Paul Menzel <pmenzel@...gen.mpg.de>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Subject: [PATCH 5.4 80/87] Bluetooth: Fix bt_skb_sendmmsg not allocating partial chunks

From: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>

commit 29fb608396d6a62c1b85acc421ad7a4399085b9f upstream.

Since bt_skb_sendmmsg can be used with the likes of SOCK_STREAM it
shall return the partial chunks it could allocate instead of freeing
everything as otherwise it can cause problems like bellow.

Fixes: 81be03e026dc ("Bluetooth: RFCOMM: Replace use of memcpy_from_msg with bt_skb_sendmmsg")
Reported-by: Paul Menzel <pmenzel@...gen.mpg.de>
Link: https://lore.kernel.org/r/d7206e12-1b99-c3be-84f4-df22af427ef5@molgen.mpg.de
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=215594
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Tested-by: Paul Menzel <pmenzel@...gen.mpg.de> (Nokia N9 (MeeGo/Harmattan)
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/bluetooth/bluetooth.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -423,8 +423,7 @@ static inline struct sk_buff *bt_skb_sen
 
 		tmp = bt_skb_sendmsg(sk, msg, len, mtu, headroom, tailroom);
 		if (IS_ERR(tmp)) {
-			kfree_skb(skb);
-			return tmp;
+			return skb;
 		}
 
 		len -= tmp->len;