linux-kernel - Re: [syzbot] [bridge?] KMSAN: uninit-value in br_dev

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Message-ID: <tencent_6BDDD81904CFB50DA5A5BD0D9612535DE607@qq.com>
Date: Sun, 12 May 2024 17:38:54 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+a63a1f6a062033cf0f40@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bridge?] KMSAN: uninit-value in br_dev_xmit (2)

please test uiv in br_dev_xmit

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dccb07f2914c

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index b99127712e67..578590c83580 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2247,6 +2247,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 		goto nodata;
 	size = SKB_WITH_OVERHEAD(size);
 
+	memset(data, 0, size);
 	/* Copy only real data... and, alas, header. This should be
 	 * optimized for the cases when header is void.
 	 */