diff options
| author | Aditya Pakki <pakki001@umn.edu> | 2019-03-18 21:19:56 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-27 09:33:57 +0200 |
| commit | c2dc2fdc0cd17d308671fb2dcdfcb2d2b89cfcf9 (patch) | |
| tree | 4c6a50656af1e7c604f69ab386beb559101ba6ae | |
| parent | b17b42fbad1b8d2b98a6a8bf3c10a305c5d4d3e2 (diff) | |
x86/hpet: Prevent potential NULL pointer dereference
[ 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>
| -rw-r--r-- | arch/x86/kernel/hpet.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index 3fdc1e53aaac..9cce5504a5c7 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -825,6 +825,8 @@ 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: |