linux-kernel - [PATCH] ia64: perfmon: fix a possible file refcnt leak

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Date:	Tue, 08 Apr 2014 08:57:01 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] ia64: perfmon: fix a possible file refcnt leak

From: Eric Dumazet <edumazet@...gle.com>

get_file() is called before error checks in pfm_smpl_buffer_alloc()

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Fixes: cb0942b81249 ("make get_file() return its argument")
---
 arch/ia64/kernel/perfmon.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index d841c4bd6864..a7221393612e 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2297,7 +2297,7 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
 	 * partially initialize the vma for the sampling buffer
 	 */
 	vma->vm_mm	     = mm;
-	vma->vm_file	     = get_file(filp);
+	vma->vm_file	     = filp;
 	vma->vm_flags	     = VM_READ|VM_MAYREAD|VM_DONTEXPAND|VM_DONTDUMP;
 	vma->vm_page_prot    = PAGE_READONLY; /* XXX may need to change */
 
@@ -2342,7 +2342,7 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
 	 */
 	insert_vm_struct(mm, vma);
 
-	vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file,
+	vm_stat_account(vma->vm_mm, vma->vm_flags, get_file(filp),
 							vma_pages(vma));
 	up_write(&task->mm->mmap_sem);
 


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