linux-kernel - [PATCH] alpha: PTR_ERR overwrites -EINVAL in syscall osf

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Message-ID: <4B699B06.2040202@gmail.com>
Date:	Wed, 03 Feb 2010 16:49:26 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] alpha: PTR_ERR overwrites -EINVAL in syscall osf_mount

The initial -EINVAL value is overwritten by `retval = PTR_ERR(name)'.
If this isn't an error pointer and typenr is not 1, 6 or 9, then
this retval, a pointer cast to a long, is returned.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
Was this intended? Not sure whether this can occur, found by code
analysis.

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 62619f2..53c213f 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -361,7 +361,7 @@ osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, char __user *, path,
 		int, flag, void __user *, data)
 {
-	int retval = -EINVAL;
+	int retval;
 	char *name;
 
 	name = getname(path);
@@ -379,6 +379,7 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, char __user *, path,
 		retval = osf_procfs_mount(name, data, flag);
 		break;
 	default:
+		retval = -EINVAL;
 		printk("osf_mount(%ld, %x)\n", typenr, flag);
 	}
 	putname(name);
--
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