linux-kernel - Re: [syzbot] [hams?] KMSAN: uninit-value in nr_route

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Date: Sun,  3 Mar 2024 20:41:12 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f770ce3566e60e5573ac@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hams?] KMSAN: uninit-value in nr_route_frame

please test uninit-value in nr_route_frame

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

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index edbbef563d4d..5ca5a608daec 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -656,6 +656,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	 * to allow max possible filling before reallocation.
 	 */
 	prefetchw(data + SKB_WITH_OVERHEAD(size));
+	memset(data, 0, size);
 
 	/*
 	 * Only clear those fields we need to clear, not those that we will