linux-kernel - [PATCH] x86: uv: Fix potential NULL pointer dereference of kmalloc

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Date:   Sat,  2 Mar 2019 15:09:04 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Nicolai Stange <nstange@...e.de>,
        Kees Cook <keescook@...omium.org>,
        Andrew Banman <abanman@....com>,
        Mike Travis <mike.travis@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Varsha Rao <rvarsha016@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: uv: Fix potential NULL pointer dereference of kmalloc_node

kmalloc_node might fail to allocate memory for thp field. This fix
attempts to avoid a potential NULL pointer dereference.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 arch/x86/platform/uv/tlb_uv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index a4130b84d1ff..5a6d51e30a36 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -2011,6 +2011,9 @@ static void make_per_cpu_thp(struct bau_control *smaster)
 	size_t hpsz = sizeof(struct hub_and_pnode) * num_possible_cpus();
 
 	smaster->thp = kmalloc_node(hpsz, GFP_KERNEL, smaster->osnode);
+	if (!smaster->thp)
+		return;
+
 	memset(smaster->thp, 0, hpsz);
 	for_each_present_cpu(cpu) {
 		smaster->thp[cpu].pnode = uv_cpu_hub_info(cpu)->pnode;
-- 
2.17.1