linux-kernel - [EDT] [PATCH] devpts/inode.c : Fix Possible dentry NULL dereference

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Message-id: <1817342376.533191432204130151.JavaMail.weblogic@ep2mlwas07b>
Date:	Thu, 21 May 2015 10:28:52 +0000 (GMT)
From:	Maninder Singh <maninder1.s@...sung.com>
To:	akpm@...ux-foundation.org, dhowells@...hat.com, fabf@...net.be,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	"v.narang@...sung.com" <v.narang@...sung.com>
Subject: [EDT] [PATCH] devpts/inode.c : Fix Possible dentry NULL dereference


EP-F6AA0618C49C4AEDA73BFF1B39950BAB

Hi,

Subject: [PATCH 1/1] devpts/inode.c : Fix Possible dentry NULL dereference

Issue reported by static tool Analyzer (Prevent).
d_find_alias can return NULL to deentry, Thus we need NULL check 
before calling d_delete(dentry)

Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
Reviewed-by: Vaneet Narang <v.narang@...sung.com>
---
 fs/devpts/inode.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index add5663..0350ac2 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -663,7 +663,8 @@ void devpts_pty_kill(struct inode *inode)
 	dentry = d_find_alias(inode);
 
 	drop_nlink(inode);
-	d_delete(dentry);
+	if (dentry)
+		d_delete(dentry);
 	dput(dentry);	/* d_alloc_name() in devpts_pty_new() */
 	dput(dentry);		/* d_find_alias above */
 
-- 
1.7.1

Thanks ,
Maninder Singh