s390/early: fix sclp_early_sccb variable lifetime

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[ Upstream commit 639886b71d ]

Commit ada1da31ce ("s390/sclp: sort out physical vs
virtual pointers usage") fixed the notion of virtual
address for sclp_early_sccb pointer. However, it did
not take into account that kasan_early_init() can also
output messages and sclp_early_sccb should be adjusted
by the time kasan_early_init() is called.

Currently it is not a problem, since virtual and physical
addresses on s390 are the same. Nevertheless, should they
ever differ, this would cause an invalid pointer access.

Fixes: ada1da31ce ("s390/sclp: sort out physical vs virtual pointers usage")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Alexander Gordeev 2022-12-15 08:00:34 +01:00 • committed by Greg Kroah-Hartman

parent 0903111d67

commit ec75af7e81

3 changed files with 2 additions and 2 deletions

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1

arch/s390/kernel/early.c

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1

arch/s390/kernel/head64.S

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2

drivers/s390/char/sclp_early.c

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