linux-kernel - [PATCH] Drop reference added by grab

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Date:   Thu, 5 Jan 2017 19:33:41 +0800
From:   Zhou Chengming <zhouchengming1@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <viro@...iv.linux.org.uk>,
        <ebiederm@...ssion.com>, <balbi@...nel.org>
CC:     <konishi.ryusuke@....ntt.co.jp>, <jack@...e.cz>,
        <dmitry.torokhov@...il.com>, <caiqian@...hat.com>,
        <yangshukui@...wei.com>, <guohanjun@...wei.com>,
        <dingtianhong@...wei.com>, <lizefan@...wei.com>,
        <zhouchengming1@...wei.com>
Subject: [PATCH] Drop reference added by grab_header

Fixes CVE-2016-9191.

Reported-by: CAI Qian <caiqian@...hat.com>
Tested-by: Yang Shukui <yangshukui@...wei.com>
Signed-off-by: Zhou Chengming <zhouchengming1@...wei.com>
---
 fs/proc/proc_sysctl.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 5d931bf..c4c90bd 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -718,7 +718,7 @@ static int proc_sys_readdir(struct file *file, struct dir_context *ctx)
 	ctl_dir = container_of(head, struct ctl_dir, header);
 
 	if (!dir_emit_dots(file, ctx))
-		return 0;
+		goto out;
 
 	pos = 2;
 
@@ -728,6 +728,7 @@ static int proc_sys_readdir(struct file *file, struct dir_context *ctx)
 			break;
 		}
 	}
+out:
 	sysctl_head_finish(head);
 	return 0;
 }
-- 
1.7.7