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fix KASAN PoolUseAfterFree for async write - can't read bp after VOP_STRATEGY() 

problem found and fix provided by Paul Ripke
This commit is contained in:
jdolecek 2020-05-24 14:11:49 +00:00
parent 555a6dbc47
commit 86cd877033
1 changed files with 3 additions and 3 deletions
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6
sys/uvm/uvm_swap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_swap.c,v 1.192 2020/05/22 11:54:05 jdolecek Exp $ */
/* $NetBSD: uvm_swap.c,v 1.193 2020/05/24 14:11:49 jdolecek Exp $ */
/*
* Copyright (c) 1995, 1996, 1997, 2009 Matthew R. Green
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_swap.c,v 1.192 2020/05/22 11:54:05 jdolecek Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_swap.c,v 1.193 2020/05/24 14:11:49 jdolecek Exp $");
#include "opt_uvmhist.h"
#include "opt_compat_netbsd.h"
@ -1985,7 +1985,7 @@ uvm_swap_io(struct vm_page **pps, int startslot, int npages, int flags)
* Reads are always synchronous; if this changes, we
* need to add an asynchronous path for decryption.
*/
KASSERT((bp->b_flags & B_READ) == 0);
KASSERT(write);
return 0;
}