linux-kernel - [PATCH 1/1] fs/affs/super.c: bugfix / double free

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Message-Id: <20140504083604.7ecda0d8ace7927aa41ff98d@skynet.be>
Date:	Sun, 4 May 2014 08:36:04 +0200
From:	Fabian Frederick <fabf@...net.be>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	akpm <akpm@...ux-foundation.org>, Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 1/1] fs/affs/super.c: bugfix / double free

842a859db26b70
("affs: use ->kill_sb() to simplify ->put_super() and failure exits of ->mount()")
adds .kill_sb which frees sbi but doesn't remove sbi free in case of parse_options
error causing double free+random crash.

Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/affs/super.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/affs/super.c b/fs/affs/super.c
index 6d589f2..895ac7d 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -340,8 +340,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 				&blocksize,&sbi->s_prefix,
 				sbi->s_volume, &mount_flags)) {
 		printk(KERN_ERR "AFFS: Error parsing options\n");
-		kfree(sbi->s_prefix);
-		kfree(sbi);
 		return -EINVAL;
 	}
 	/* N.B. after this point s_prefix must be released */
-- 
1.8.4.5

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