[ 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 <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: Borislav Petkov <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Kees Cook <[email protected]> Cc: Joe Perches <[email protected]> Cc: Nicolai Stange <[email protected]> Cc: Roland Dreier <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Sasha Levin <[email protected]> --- arch/x86/kernel/hpet.c | 2 ++ 1 file changed, 2 insertions(+) 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: -- 2.19.1
