linux-kernel - [PATCH] powerpc: kernel/kgdb.c: fix memory leakage

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Date:	Mon, 14 Jan 2013 17:26:32 +0000
From:	Cong Ding <dinggnu@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Tiejun Chen <tiejun.chen@...driver.com>,
	Michael Neuling <mikey@...ling.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:	Cong Ding <dinggnu@...il.com>
Subject: [PATCH] powerpc: kernel/kgdb.c: fix memory leakage

the variable backup_current_thread_info isn't freed before existing the
function.

Signed-off-by: Cong Ding <dinggnu@...il.com>
---
 arch/powerpc/kernel/kgdb.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 8747447..5ca82cd 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -154,12 +154,12 @@ static int kgdb_handle_breakpoint(struct pt_regs *regs)
 static int kgdb_singlestep(struct pt_regs *regs)
 {
 	struct thread_info *thread_info, *exception_thread_info;
-	struct thread_info *backup_current_thread_info = \
-		(struct thread_info *)kmalloc(sizeof(struct thread_info), GFP_KERNEL);
+	struct thread_info *backup_current_thread_info;
 
 	if (user_mode(regs))
 		return 0;
 
+	backup_current_thread_info = (struct thread_info *)kmalloc(sizeof(struct thread_info), GFP_KERNEL);
 	/*
 	 * On Book E and perhaps other processors, singlestep is handled on
 	 * the critical exception stack.  This causes current_thread_info()
@@ -185,6 +185,7 @@ static int kgdb_singlestep(struct pt_regs *regs)
 		/* Restore current_thread_info lastly. */
 		memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info);
 
+	kfree(backup_current_thread_info);
 	return 1;
 }
 
-- 
1.7.9.5

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