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x86/hpet: Prevent potential NULL pointer dereference

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[ Upstream commit 2e84f116afca3719c9d0a1a78b47b48f75fd5724 ]

hpet_virt_address may be NULL when ioremap_nocache fail, but the code lacks
a check.

Add a check to prevent NULL pointer dereference.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: kjlu@umn.edu
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Joe Perches <joe@perches.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Roland Dreier <roland@purestorage.com>
Link: https://lkml.kernel.org/r/20190319021958.17275-1-pakki001@umn.edu
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aditya Pakki 2019-03-18 21:19:56 -05:00 committed by Greg Kroah-Hartman
parent a95d4e6039
commit ec1fdc02cc
1 changed files with 2 additions and 0 deletions
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arch/x86/kernel/hpet.c
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@ -914,6 +914,8 @@ int __init hpet_enable(void)
return 0;
hpet_set_mapping();
if (!hpet_virt_address)
return 0;
/*
* Read the period and check for a sane value: