ipv4: ip_gre: Avoid skb_pull() failure in ipgre_xmit()
[ Upstream commit 80d875cf ] In ipgre_xmit(), skb_pull() may fail even if pskb_inet_may_pull() returns true. For example, applications can use PF_PACKET to create a malformed packet with no IP header. This type of packet causes a problem such as uninit-value access. This patch ensures that skb_pull() can pull the required size by checking the skb with pskb_network_may_pull() before skb_pull(). Fixes: c5441932 ("GRE: Refactor GRE tunneling code.") Signed-off-by:Shigeru Yoshida <syoshida@redhat.com> Reviewed-by:
Eric Dumazet <edumazet@google.com> Reviewed-by:
Suman Ghosh <sumang@marvell.com> Link: https://lore.kernel.org/r/20231202161441.221135-1-syoshida@redhat.com Signed-off-by:
Paolo Abeni <pabeni@redhat.com> Signed-off-by:
Sasha Levin <sashal@kernel.org>
parent
e38cd534
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