From: Dave Jones <davej@redhat.com>
Date: Fri, 13 Jul 2012 17:35:36 +0000 (-0400)
Subject: Remove easily user-triggerable BUG from generic_setlease
X-Git-Tag: v3.2.24~62
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8f2c5a741019b7ed10643040fe72e6152ee16ed6;p=karo-tx-linux.git

Remove easily user-triggerable BUG from generic_setlease

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@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/fs/locks.c b/fs/locks.c
index 0d68f1f81799..6a64f154db04 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);