Nikola Z. Ivanov 175556c049 netdevsim: zero initialize struct iphdr in dummy sk_buff ...

[ Upstream commit 35eaa6d8d6 ]

Syzbot reports a KMSAN uninit-value originating from
nsim_dev_trap_skb_build, with the allocation also
being performed in the same function.

Fix this by calling skb_put_zero instead of skb_put to
guarantee zero initialization of the whole IP header.

Closes: https://syzkaller.appspot.com/bug?extid=23d7fcd204e3837866ff
Fixes: da58f90f11 ("netdevsim: Add devlink-trap support")
Signed-off-by: Nikola Z. Ivanov <zlatistiv@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260426201434.742030-1-zlatistiv@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-06-01 17:29:43 +02:00

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bpf.c

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bus.c

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dev.c

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ethtool.c

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fib.c

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health.c

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ipsec.c

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Makefile

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netdev.c

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netdevsim.h

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udp_tunnels.c

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