diff options
| author | Aditya Pakki <pakki001@umn.edu> | 2019-03-19 05:19:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-27 10:30:28 +0300 |
| commit | f57149631d43174684b106126870198958d89982 (patch) | |
| tree | aac47227dfd011867d8a795f4cd93fdb532d7b5c | |
| parent | 72cee3afd885c13966c0eece5bb980688538ff1c (diff) | |
| download | linux-f57149631d43174684b106126870198958d89982.tar.xz | |
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 319bcb9372fe..3e9c5725732f 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -799,6 +799,8 @@ 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: |