linux-kernel - [ 047/108] Remove easily user-triggerable BUG from generic

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Date:	Mon, 23 Jul 2012 02:07:38 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Dave Jones <davej@...hat.com>
Subject: [ 047/108] Remove easily user-triggerable BUG from generic_setlease

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Jones <davej@...hat.com>

commit 8d657eb3b43861064d36241e88d9d61c709f33f0 upstream.

This can be trivially triggered from userspace by passing in something unexpected.

    kernel BUG at fs/locks.c:1468!
    invalid opcode: 0000 [#1] SMP
    RIP: 0010:generic_setlease+0xc2/0x100
    Call Trace:
      __vfs_setlease+0x35/0x40
      fcntl_setlease+0x76/0x150
      sys_fcntl+0x1c6/0x810
      system_call_fastpath+0x1a/0x1f

Signed-off-by: Dave Jones <davej@...hat.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/locks.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/locks.c b/fs/locks.c
index 814c51d..fce6238 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1465,7 +1465,7 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
 	case F_WRLCK:
 		return generic_add_lease(filp, arg, flp);
 	default:
-		BUG();
+		return -EINVAL;
 	}
 }
 EXPORT_SYMBOL(generic_setlease);


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