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Take care not to dereference NULL datapointer from fd table

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Make output more readable and label what lock we are examining.
This commit is contained in:
blymn 2008-07-14 10:15:11 +00:00
parent f61fd03291
commit a7db4edf3b
1 changed files with 11 additions and 7 deletions
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18
sys/ddb/db_xxx.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_xxx.c,v 1.50 2008/07/10 13:28:23 blymn Exp $ */
/* $NetBSD: db_xxx.c,v 1.51 2008/07/14 10:15:11 blymn Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_xxx.c,v 1.50 2008/07/10 13:28:23 blymn Exp $");
__KERNEL_RCSID(0, "$NetBSD: db_xxx.c,v 1.51 2008/07/14 10:15:11 blymn Exp $");
#include "opt_kgdb.h"
@ -144,14 +144,18 @@ db_show_files_cmd(db_expr_t addr, bool haddr,
fp = ff->ff_file;
/* Only look at vnodes... */
if (fp->f_type == DTYPE_VNODE) {
vn = (struct vnode *) fp->f_data;
vfs_vnode_print(vn, full, db_printf);
if ((fp != NULL) && (fp->f_type == DTYPE_VNODE)) {
if (fp->f_data != NULL) {
vn = (struct vnode *) fp->f_data;
vfs_vnode_print(vn, full, db_printf);
#ifdef LOCKDEBUG
lockdebug_lock_print(&(vn->v_uobj.vmobjlock),
db_printf);
db_printf("\nv_uobj.vmobjlock lock details:\n");
lockdebug_lock_print(&(vn->v_uobj.vmobjlock),
db_printf);
db_printf("\n");
#endif
}
}
}
}