From: tip-bot for Kangjie Lu <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: sashal@kernel.org, mojha@codeaurora.org, hpa@zytor.com,
kys@microsoft.com, sthemmin@microsoft.com, kjlu@umn.edu,
linux-kernel@vger.kernel.org, mingo@kernel.org, bp@alien8.de,
tglx@linutronix.de, haiyangz@microsoft.com
Subject: [tip:x86/urgent] x86/hyperv: Prevent potential NULL pointer dereference
Date: Thu, 21 Mar 2019 04:30:22 -0700 [thread overview]
Message-ID: <tip-534c89c22e26b183d838294f0937ee092c82ad3a@git.kernel.org> (raw)
In-Reply-To: <20190314054651.1315-1-kjlu@umn.edu>
Commit-ID: 534c89c22e26b183d838294f0937ee092c82ad3a
Gitweb: https://git.kernel.org/tip/534c89c22e26b183d838294f0937ee092c82ad3a
Author: Kangjie Lu <kjlu@umn.edu>
AuthorDate: Thu, 14 Mar 2019 00:46:51 -0500
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 21 Mar 2019 12:24:39 +0100
x86/hyperv: Prevent potential NULL pointer dereference
The page allocation in hv_cpu_init() can fail, but the code does not
have a check for that.
Add a check and return -ENOMEM when the allocation fails.
[ tglx: Massaged changelog ]
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Acked-by: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: pakki001@umn.edu
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-hyperv@vger.kernel.org
Link: https://lkml.kernel.org/r/20190314054651.1315-1-kjlu@umn.edu
---
arch/x86/hyperv/hv_init.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 6461a16b4559..e4ba467a9fc6 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -103,9 +103,13 @@ static int hv_cpu_init(unsigned int cpu)
u64 msr_vp_index;
struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()];
void **input_arg;
+ struct page *pg;
input_arg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg);
- *input_arg = page_address(alloc_page(GFP_KERNEL));
+ pg = alloc_page(GFP_KERNEL);
+ if (unlikely(!pg))
+ return -ENOMEM;
+ *input_arg = page_address(pg);
hv_get_vp_index(msr_vp_index);
prev parent reply other threads:[~2019-03-21 11:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-14 5:46 [PATCH] hyperv: a potential NULL pointer dereference Kangjie Lu
2019-03-14 14:56 ` KY Srinivasan
2019-03-20 10:20 ` Thomas Gleixner
2019-03-20 14:40 ` KY Srinivasan
2019-03-20 15:50 ` Mukesh Ojha
2019-03-21 11:30 ` tip-bot for Kangjie Lu [this message]
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