linux-kernel - [PATCH 1/2] x86/xen: Fix memory leak in xen_smp_intr_init{

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Date:   Sat, 19 Nov 2022 16:59:22 +0800
From:   Xiu Jianfeng <xiujianfeng@...wei.com>
To:     <jgross@...e.com>, <boris.ostrovsky@...cle.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>, <hpa@...or.com>, <jeremy@...p.org>
CC:     <x86@...nel.org>, <xen-devel@...ts.xenproject.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] x86/xen: Fix memory leak in xen_smp_intr_init{_pv}()

These local variables @{resched|pmu|callfunc...}_name saves the new
string allocated by kasprintf(), and when bind_{v}ipi_to_irqhandler()
fails, it goes to the @fail tag, and calls xen_smp_intr_free{_pv}() to
free resource, however the new string is not saved, which cause a memory
leak issue. fix it.

Fixes: 9702785a747a ("i386: move xen")
Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 arch/x86/xen/smp.c    | 16 ++++++++++++----
 arch/x86/xen/smp_pv.c |  8 ++++++--
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index c3e1f9a7d43a..6e9426b6b18a 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -71,8 +71,10 @@ int xen_smp_intr_init(unsigned int cpu)
 				    IRQF_PERCPU|IRQF_NOBALANCING,
 				    resched_name,
 				    NULL);
-	if (rc < 0)
+	if (rc < 0) {
+		kfree(resched_name);
 		goto fail;
+	}
 	per_cpu(xen_resched_irq, cpu).irq = rc;
 	per_cpu(xen_resched_irq, cpu).name = resched_name;
 
@@ -83,8 +85,10 @@ int xen_smp_intr_init(unsigned int cpu)
 				    IRQF_PERCPU|IRQF_NOBALANCING,
 				    callfunc_name,
 				    NULL);
-	if (rc < 0)
+	if (rc < 0) {
+		kfree(callfunc_name);
 		goto fail;
+	}
 	per_cpu(xen_callfunc_irq, cpu).irq = rc;
 	per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
 
@@ -94,8 +98,10 @@ int xen_smp_intr_init(unsigned int cpu)
 					     xen_debug_interrupt,
 					     IRQF_PERCPU | IRQF_NOBALANCING,
 					     debug_name, NULL);
-		if (rc < 0)
+		if (rc < 0) {
+			kfree(debug_name);
 			goto fail;
+		}
 		per_cpu(xen_debug_irq, cpu).irq = rc;
 		per_cpu(xen_debug_irq, cpu).name = debug_name;
 	}
@@ -107,8 +113,10 @@ int xen_smp_intr_init(unsigned int cpu)
 				    IRQF_PERCPU|IRQF_NOBALANCING,
 				    callfunc_name,
 				    NULL);
-	if (rc < 0)
+	if (rc < 0) {
+		kfree(callfunc_name);
 		goto fail;
+	}
 	per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
 	per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
 
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index 480be82e9b7b..228d0207380c 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -124,8 +124,10 @@ int xen_smp_intr_init_pv(unsigned int cpu)
 				    IRQF_PERCPU|IRQF_NOBALANCING,
 				    callfunc_name,
 				    NULL);
-	if (rc < 0)
+	if (rc < 0) {
+		kfree(callfunc_name);
 		goto fail;
+	}
 	per_cpu(xen_irq_work, cpu).irq = rc;
 	per_cpu(xen_irq_work, cpu).name = callfunc_name;
 
@@ -135,8 +137,10 @@ int xen_smp_intr_init_pv(unsigned int cpu)
 					     xen_pmu_irq_handler,
 					     IRQF_PERCPU|IRQF_NOBALANCING,
 					     pmu_name, NULL);
-		if (rc < 0)
+		if (rc < 0) {
+			kfree(pmu_name);
 			goto fail;
+		}
 		per_cpu(xen_pmu_irq, cpu).irq = rc;
 		per_cpu(xen_pmu_irq, cpu).name = pmu_name;
 	}
-- 
2.17.1