[ 01/37] Remove easily user-triggerable BUG from generic_setlease

From: Greg Kroah-Hartman
Date: Tue Jul 17 2012 - 20:03:25 EST


From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>

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

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

From: Dave Jones <davej@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/locks.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1465,7 +1465,7 @@ int generic_setlease(struct file *filp,
case F_WRLCK:
return generic_add_lease(filp, arg, flp);
default:
- BUG();
+ return -EINVAL;
}
}
EXPORT_SYMBOL(generic_setlease);


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