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[ Upstream commit 5d8dbb7 ] We need to check up->dirmask to avoid shift-out-of-bounce bug, since up->dirmask comes from userspace. Also, added XFRM_USERPOLICY_DIRMASK_MAX constant to uapi to inform user-space that up->dirmask has maximum possible value Fixes: 2d151d3 ("xfrm: Add possibility to set the default to block if we have no policy") Reported-and-tested-by: syzbot+9cd5837a045bbee5b810@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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